Base:
Mega:
[OVERVIEW]
* Magic Bounce is a really useful ability, as it's able to prevent entry hazards from being set on the field and also prevents Mega Diancie's foes from trying to spread status.
* Boasting a base 160 in both offensive stats, Mega Diancie is able to utilize a mixed set incredibly well, being able to quite effectively dent through dedicated special and physical walls, such as Blissey and Giratina.
* Rock / Fairy is a useful offensive typing, as it allows Mega Diancie to check many defensive threats such as Ho-Oh, Lugia, Mega Sableye, Blissey, and Tyranitar as well as some offensive threats such as Yveltal, Mega Salamence, and Rayquaza as long as the latter two don't run Earthquake.
* At the same time, Mega Diancie loses to some of the most common offensive threats in the tier such as Primal Groudon, Necrozma-DM, Primal Kyogre, Mega Lucario, and Arceus Ground.
* Although it has a useful ability in Magic Bounce, Mega Diancie still loses to most of the common entry hazard setters in the tier such as Primal Groudon, Excadrill, Ferrothorn, and Skill Swap Deoxys-S sets, so it has to rely on other Pokemon in the tier to effectively keep entry hazards off the field. As a result, Mega Diancie can only really utilize its ability against more passive playstyles such as stall.
* Although base 110 in both defenses is quite respectable, its low HP combined with the fact that it has to run a nature that reduces bulk results in Mega Diancie being rather frail, even when those stats are boosted.
* Although a base 110 Speed is relatively impressive on paper, it should be noted that many of Mega Diancie's checks actually outspeed it, as support Arceus formes opt to run enough Speed investment to outpace Mega Lucario and other threats such as Xerneas commonly use a Choice Scarf.
* Due to the fact that Mega Diancie takes up a Mega slot and the fact that Necrozma-DM and Arceus Ground are two of the most common Pokemon in the tier, it is often hard to justify Mega Diancie's placement on a team.
[SET]
name: Mega Diancie
move 1: Moonblast
move 2: Diamond Storm
move 3: Earth Power / Toxic
move 4: Stealth Rock / Heal Bell
item: Diancite
ability: Clear Body
nature: Naive
evs: 24 Atk / 232 SpA / 252 Spe
[SET COMMENTS]
Moves
========
* Moonblast is a Fairy-type STAB attack that allows Mega Diancie to hit a significant amount of the tier for neutral damage. It's also useful for hitting Marshadow, Mega Salamence, Zygarde-C, Rayquaza, Mega Sableye, and Tyranitar.
* Diamond Storm is a useful 100-Base Power STAB move that hits Flying-type Pokemon such as Ho-Oh for super effective damage. It also takes advantage of Mega Diancie's high Attack stat and allows it to easily take care of Pokemon with high Special Defense such as Blissey, Primal Kyogre, and Gothitelle. Another useful perk of Diamond Storm is the fact that it has a 50% chance to boost Mega Diancie's Defense by two stages, allowing it to survive crucial attacks such as a Precipice Blades from an uninvested Primal Groudon.
* Earth Power is useful for dealing with common Fairy-resistant Pokemon such as Primal Groudon, Mega Gengar, Magearna, and Toxapex. It should be noted, though, that there are a large number of Steel-type Pokemon that are unfazed by Earth Power, either due to a secondary typing that lets them take neutral damage from Earth Power or an ability combined with a lot of natural bulk that allows them to take minimal damage from Earth Power.
* Toxic punishes just about every non-Steel- and Poison-type Pokemon that switches in, wearing them down and making them easier for Diancie and other teammates to KO.
* Running Stealth Rock on Mega Diancie means that teammates such as Necrozma-DM and Primal Groudon don't have to run it and are then capable of running more offensive sets.
* Heal Bell allows Mega Diancie to act as an offensive cleric and can be very useful against offensive teams, where Mega Diancie can struggle to put in work and therefore help its teammates by curing them of status and slightly wearing down foes.
* Endeavor allows Mega Diancie to take advantage of its low HP stat and make offensive threats easier to wear down.
Set Details
========
* Maximum EVs in Speed let Mega Diancie take advantage of its base 110 Speed tier.
* 24 EVs in Attack guarantee a 2HKO on Blissey, meaning that it's unable to PP stall Mega Diancie with Soft-Boiled.
* The remainder of the EVs are placed in Special Attack for maximum damage output.
* A Naive nature is chosen so Mega Diancie is able to take advantage of its Speed stat and potential Defense boosts from Diamond Storm as well as effectively act as a mixed attacker.
* Diancite is required for Diancie to become Mega Diancie.
Usage Tips
========
* Try to Mega Evolve Diancie as soon as possible, as that way you're able to utilize its ability more effectively. Note that Clear Body can occasionally be useful when Sticky Web is on the field or to prevent Intimidate Attack drops from Salamence before it Mega Evolves, but in reality, this is still hard to justify not Mega Evolving, since Mega Diancie has a solid matchup against Sticky Web setters and is able to KO Mega Salamence with Moonblast anyway.
* While you should avoid letting Mega Diancie take any damage at all, it is best to bring Mega Diancie in against status or utility moves or against attacks that it resists such as Dark- and Flying-type moves.
* Although Diancie can quite easily gain a +2 Defense boost with Diamond Storm, it is still better to avoid letting it take supereffective physical attacks, as it is rarely able to survive these, even at +2.
* Mega Diancie is a very matchup-dependent Pokemon, as it can be a potential wincon against stall teams after defensive threats such as support Arceus-Ground and Arceus-Water have been removed from the field; against offensive teams, however, just use Mega Diancie to try to reflect entry hazards and other status moves, wear down foes with attacks, and potentially heal the status conditions of teammates with Heal Bell.
* Although Diamond Storm provides great benefits, be wary that it only has 8 PP, so avoid using it too liberally. It is especially important to conserve the PP of Diamond Storm when facing stall teams, as Mega Diancie needs Diamond Storm to KO threats such as Blissey and Ho-Oh.
Team Options
========
* Gothitelle makes a brilliant partner for Mega Diancie, as it can trap the support Arceus formes that threaten Mega Diancie as well as other defensive Pokemon that pose a great threat to Mega Diancie such as Celesteela and Ferrothorn. It is also worth noting that the core of Gothitelle + Mega Diancie beats every relevant Defogger in the tier one-on-one, which makes it easier for Mega Diancie to set up Stealth Rock and keep it on the field for the majority of the game.
* Necrozma-DM is a brilliant partner for Mega Diancie, as it is able to deal with Xerneas, Arceus-Water, and Arceus-Fairy lacking Will-O-Wisp. In return, Necrozma-DM appreciates Mega Diancie's ability to deal with Ho-Oh and Yveltal, and Mega Diancie's Stealth Rock support lets Necrozma-DM run more offensive sets like Double Dance. Support Necrozma-DM also makes a useful partner for Mega Diancie, as it is a strong Steel-type that shuts down some support Arceus formes such as Arceus-Ground and Arceus-Fairy.
* Ho-Oh makes a nice partner, as it can threaten the Steel-types that threaten Mega Diancie, and it also appreciates Mega Diancie's ability to prevent entry hazards from being set.
* Arceus-Ground is a useful partner, as it provides the team with a secondary means of keeping hazards off the field with Defog, as well as threatening many of the Ground- and Steel-type Pokemon that beat Diancie, such as Primal Groudon, Excadrill, Mega Lucario, and Zygarde-C.
* Giratina-O can take advantage of the status that Mega Diancie can potentially reflect with Magic Bounce and appreciates Diancie's resistance to Dark-type attacks. Furthermore, it can help support Mega Diancie by Defogging away hazards.
* Primal Groudon is also a nice partner for Mega Diancie, as it is able to check Necrozma-DM more effectively than Arceus-Ground and is also an effective check to Xerneas.
* Both offensive and defensive variants of Zygarde-C make good partners for Mega Diancie, as they provide the team with a check to Primal Groudon, Necrozma-DM, Earthquake Mega Salamence, offensive Arceus-Ground sets, Mega Lucario, and Ho-Oh. Offensive variants of Zygarde-C particularly appreciate Diancie's ability to deal with Yveltal.
* Marshadow makes a nice offensive partner for Mega Diancie, as it provides teams with a means of threatening Necrozma-DM, Ultra Necrozma, and common Ghost-types such as Mega Gengar, as well as providing teams with priority, making it easier to clean off weakened foes thanks to Shadow Sneak. Marshadow also appreciates Mega Diancie dealing with common threats to it such as Yveltal and checking Mega Salamence and Ho-Oh, which are two Pokemon that Marshadow can struggle with depending on whether it runs Hidden Power Ice or Rock Tomb.
* Arceus-Water makes a good defensive partner for Mega Diancie, as it is able to check a number of Pokemon that Mega Diancie struggles to deal with, such as Arceus-Ground, Primal Groudon, Ho-Oh, Mega Salamence, and Primal Kyogre sets lacking Thunder. Arceus-Water sets running Will-O-Wisp also have a decent matchup against Necrozma-DM and Mega Lucario, as it resists their Steel-type attacks and can burn them.
* Yveltal is a good offensive partner for Mega Diancie, since it threatens Necrozma-DM, Marshadow, and Mega Gengar. It also provides the team with a Ground immunity, which is crucial to have in a metagame dominated by Primal Groudon.
[STRATEGY COMMENTS]
Other Options
=============
Hidden Power Fire can be a nice surprise attack, potentially OHKOing Mega Scizor after Stealth Rock damage and 2HKOing Ferrothorn, which are both otherwise relatively unfazed by Mega Diancie's attacks. However, this can only be used when predicting either of these Pokemon switching in, as both of them are able to OHKO Mega Diancie.
* Calm Mind can be a useful move, as it boosts Mega Diancie's Special Attack and Special Defense by one stage, making it a lot harder to switch into and a lot harder for defensive teams to wear down, since Magic Bounce grants Mega Diancie an immunity to Taunt and status moves. However, Mega Diancie only really gets to take advantage of Calm Mind in matchups against stall, which, considering that Mega Diancie's best matchup is already against stall, makes it hard to justify over any of its other common moves.
* Protect can be used to allow Diancie to Mega Evolve without having to take any damage doing so. It can also be useful for scouting for super effective coverage moves. However, Diancie struggles to find the moveslot to run it, as it already struggles between the options of Heal Bell, Endeavor, and Stealth Rock.
* Magnet Rise can be useful for dealing with Primal Groudon, as Mega Diancie can then 2HKO it with Earth Power. However, most Pokemon with Ground-type attacks are still able to beat Mega Diancie in a one-on-one situation, as Zygarde is able to hit it with Thousand Arrows regardless and Arceus-Ground outspeeds it.
* Rock Polish can boost Mega Diancie's Speed, potentially giving it more offensive presence, and making it harder to be revenge killed by faster Pokemon in the tier such as Marshadow; however, Mega Diancie still faces the issues of failing to KO many of the Pokemon that threaten it, as Mega Lucario and Mega Scizor have access to priority Bullet Punch, and Necrozma-DM and Arceus-Ground can KO Mega Diancie in return. Rock Polish also prevents it from running more effective moves such as Stealth Rock and Heal Bell.
* Power Gem and a Timid nature can be run in place of Diamond Storm on a Calm Mind Set to make Mega Diancie a full special sweeper, but it should be noted that it struggles immensely against special walls, as it has to get to +6 in order to be able to 2HKO Chansey with Moonblast.
Checks and Counters
===================
**Steel-types**: Diancie has a 4x weakness to Steel-type attacks and therefore finds even the most passive of Steel-type Pokemon to be very threatening. Although Mega Diancie runs Earth Power or occasionally Hidden Power Fire as an attempt to combat Steel-type Pokemon, there are many Steel-types in the tier that are relatively unfazed by those moves, as they have a significant amount of natural bulk or a secondary typing that makes them take neutral damage from them. For example, Celesteela is a hard-counter to Mega Diancie, as it fails to 2HKO Celesteela, even if it opts to run Hidden Power Fire, and Celesteela can OHKO it in return with Heavy Slam to get a free Defense boost. Ferrothorn tends to run maximum Special Defense investment and therefore is barely even 2HKOed by Hidden Power Fire sets. Mega Scizor is also unfazed by Mega Diancie's attacks, with the exception of the rare Hidden Power Fire, and can OHKO Mega Diancie with priority Bullet Punch.
**Ground-types**: Both offensive and support variants of Arceus-Ground easily deal with Mega Diancie, as they are able to outspeed it and OHKO it with powerful STAB attacks. Primal Groudon is able to OHKO Mega Diancie with Precipice Blades, but it should be noted that it is 2HKOed by Earth Power. Zygarde-C is able to OHKO Mega Diancie with Thousand Arrows after Stealth Rock damage, but it needs to be in its Complete forme in order to be able to tank a Moonblast.
**Primal Kyogre**: Primal Kyogre has more than enough bulk to take any of Mega Diancie's hits and OHKO it with Origin Pulse.
**Arceus-Water and Arceus-Fairy**: Arceus-Water and Arceus-Fairy can Recover off damage taken from any of Mega Diancie's attacks and wear it down with Judgment or Ice Beam in Arceus-Water's case.
**Chansey**: Chansey has enough bulk thanks to its Eviolite to shrug off any attack from Mega Diancie with Soft-Boiled. It should be noted, though, that if it is not running Seismic Toss, it can't do anything back to Mega Diancie.
**Faster Attackers and Revenge Killers**: Faster attackers such as Marshadow, Ultra Necrozma, Mega Lucario, Arceus-Ground, and Choice Scarf Xerneas can all outspeed Mega Diancie and KO it with their hard-hitting attacks.
Mega:
[OVERVIEW]
* Magic Bounce is a really useful ability, as it's able to prevent entry hazards from being set on the field and also prevents Mega Diancie's foes from trying to spread status.
* Boasting a base 160 in both offensive stats, Mega Diancie is able to utilize a mixed set incredibly well, being able to quite effectively dent through dedicated special and physical walls, such as Blissey and Giratina.
* Rock / Fairy is a useful offensive typing, as it allows Mega Diancie to check many defensive threats such as Ho-Oh, Lugia, Mega Sableye, Blissey, and Tyranitar as well as some offensive threats such as Yveltal, Mega Salamence, and Rayquaza as long as the latter two don't run Earthquake.
* At the same time, Mega Diancie loses to some of the most common offensive threats in the tier such as Primal Groudon, Necrozma-DM, Primal Kyogre, Mega Lucario, and Arceus Ground.
* Although it has a useful ability in Magic Bounce, Mega Diancie still loses to most of the common entry hazard setters in the tier such as Primal Groudon, Excadrill, Ferrothorn, and Skill Swap Deoxys-S sets, so it has to rely on other Pokemon in the tier to effectively keep entry hazards off the field. As a result, Mega Diancie can only really utilize its ability against more passive playstyles such as stall.
* Although base 110 in both defenses is quite respectable, its low HP combined with the fact that it has to run a nature that reduces bulk results in Mega Diancie being rather frail, even when those stats are boosted.
* Although a base 110 Speed is relatively impressive on paper, it should be noted that many of Mega Diancie's checks actually outspeed it, as support Arceus formes opt to run enough Speed investment to outpace Mega Lucario and other threats such as Xerneas commonly use a Choice Scarf.
* Due to the fact that Mega Diancie takes up a Mega slot and the fact that Necrozma-DM and Arceus Ground are two of the most common Pokemon in the tier, it is often hard to justify Mega Diancie's placement on a team.
[SET]
name: Mega Diancie
move 1: Moonblast
move 2: Diamond Storm
move 3: Earth Power / Toxic
move 4: Stealth Rock / Heal Bell
item: Diancite
ability: Clear Body
nature: Naive
evs: 24 Atk / 232 SpA / 252 Spe
[SET COMMENTS]
Moves
========
* Moonblast is a Fairy-type STAB attack that allows Mega Diancie to hit a significant amount of the tier for neutral damage. It's also useful for hitting Marshadow, Mega Salamence, Zygarde-C, Rayquaza, Mega Sableye, and Tyranitar.
* Diamond Storm is a useful 100-Base Power STAB move that hits Flying-type Pokemon such as Ho-Oh for super effective damage. It also takes advantage of Mega Diancie's high Attack stat and allows it to easily take care of Pokemon with high Special Defense such as Blissey, Primal Kyogre, and Gothitelle. Another useful perk of Diamond Storm is the fact that it has a 50% chance to boost Mega Diancie's Defense by two stages, allowing it to survive crucial attacks such as a Precipice Blades from an uninvested Primal Groudon.
* Earth Power is useful for dealing with common Fairy-resistant Pokemon such as Primal Groudon, Mega Gengar, Magearna, and Toxapex. It should be noted, though, that there are a large number of Steel-type Pokemon that are unfazed by Earth Power, either due to a secondary typing that lets them take neutral damage from Earth Power or an ability combined with a lot of natural bulk that allows them to take minimal damage from Earth Power.
* Toxic punishes just about every non-Steel- and Poison-type Pokemon that switches in, wearing them down and making them easier for Diancie and other teammates to KO.
* Running Stealth Rock on Mega Diancie means that teammates such as Necrozma-DM and Primal Groudon don't have to run it and are then capable of running more offensive sets.
* Heal Bell allows Mega Diancie to act as an offensive cleric and can be very useful against offensive teams, where Mega Diancie can struggle to put in work and therefore help its teammates by curing them of status and slightly wearing down foes.
* Endeavor allows Mega Diancie to take advantage of its low HP stat and make offensive threats easier to wear down.
Set Details
========
* Maximum EVs in Speed let Mega Diancie take advantage of its base 110 Speed tier.
* 24 EVs in Attack guarantee a 2HKO on Blissey, meaning that it's unable to PP stall Mega Diancie with Soft-Boiled.
* The remainder of the EVs are placed in Special Attack for maximum damage output.
* A Naive nature is chosen so Mega Diancie is able to take advantage of its Speed stat and potential Defense boosts from Diamond Storm as well as effectively act as a mixed attacker.
* Diancite is required for Diancie to become Mega Diancie.
Usage Tips
========
* Try to Mega Evolve Diancie as soon as possible, as that way you're able to utilize its ability more effectively. Note that Clear Body can occasionally be useful when Sticky Web is on the field or to prevent Intimidate Attack drops from Salamence before it Mega Evolves, but in reality, this is still hard to justify not Mega Evolving, since Mega Diancie has a solid matchup against Sticky Web setters and is able to KO Mega Salamence with Moonblast anyway.
* While you should avoid letting Mega Diancie take any damage at all, it is best to bring Mega Diancie in against status or utility moves or against attacks that it resists such as Dark- and Flying-type moves.
* Although Diancie can quite easily gain a +2 Defense boost with Diamond Storm, it is still better to avoid letting it take supereffective physical attacks, as it is rarely able to survive these, even at +2.
* Mega Diancie is a very matchup-dependent Pokemon, as it can be a potential wincon against stall teams after defensive threats such as support Arceus-Ground and Arceus-Water have been removed from the field; against offensive teams, however, just use Mega Diancie to try to reflect entry hazards and other status moves, wear down foes with attacks, and potentially heal the status conditions of teammates with Heal Bell.
* Although Diamond Storm provides great benefits, be wary that it only has 8 PP, so avoid using it too liberally. It is especially important to conserve the PP of Diamond Storm when facing stall teams, as Mega Diancie needs Diamond Storm to KO threats such as Blissey and Ho-Oh.
Team Options
========
* Gothitelle makes a brilliant partner for Mega Diancie, as it can trap the support Arceus formes that threaten Mega Diancie as well as other defensive Pokemon that pose a great threat to Mega Diancie such as Celesteela and Ferrothorn. It is also worth noting that the core of Gothitelle + Mega Diancie beats every relevant Defogger in the tier one-on-one, which makes it easier for Mega Diancie to set up Stealth Rock and keep it on the field for the majority of the game.
* Necrozma-DM is a brilliant partner for Mega Diancie, as it is able to deal with Xerneas, Arceus-Water, and Arceus-Fairy lacking Will-O-Wisp. In return, Necrozma-DM appreciates Mega Diancie's ability to deal with Ho-Oh and Yveltal, and Mega Diancie's Stealth Rock support lets Necrozma-DM run more offensive sets like Double Dance. Support Necrozma-DM also makes a useful partner for Mega Diancie, as it is a strong Steel-type that shuts down some support Arceus formes such as Arceus-Ground and Arceus-Fairy.
* Ho-Oh makes a nice partner, as it can threaten the Steel-types that threaten Mega Diancie, and it also appreciates Mega Diancie's ability to prevent entry hazards from being set.
* Arceus-Ground is a useful partner, as it provides the team with a secondary means of keeping hazards off the field with Defog, as well as threatening many of the Ground- and Steel-type Pokemon that beat Diancie, such as Primal Groudon, Excadrill, Mega Lucario, and Zygarde-C.
* Giratina-O can take advantage of the status that Mega Diancie can potentially reflect with Magic Bounce and appreciates Diancie's resistance to Dark-type attacks. Furthermore, it can help support Mega Diancie by Defogging away hazards.
* Primal Groudon is also a nice partner for Mega Diancie, as it is able to check Necrozma-DM more effectively than Arceus-Ground and is also an effective check to Xerneas.
* Both offensive and defensive variants of Zygarde-C make good partners for Mega Diancie, as they provide the team with a check to Primal Groudon, Necrozma-DM, Earthquake Mega Salamence, offensive Arceus-Ground sets, Mega Lucario, and Ho-Oh. Offensive variants of Zygarde-C particularly appreciate Diancie's ability to deal with Yveltal.
* Marshadow makes a nice offensive partner for Mega Diancie, as it provides teams with a means of threatening Necrozma-DM, Ultra Necrozma, and common Ghost-types such as Mega Gengar, as well as providing teams with priority, making it easier to clean off weakened foes thanks to Shadow Sneak. Marshadow also appreciates Mega Diancie dealing with common threats to it such as Yveltal and checking Mega Salamence and Ho-Oh, which are two Pokemon that Marshadow can struggle with depending on whether it runs Hidden Power Ice or Rock Tomb.
* Arceus-Water makes a good defensive partner for Mega Diancie, as it is able to check a number of Pokemon that Mega Diancie struggles to deal with, such as Arceus-Ground, Primal Groudon, Ho-Oh, Mega Salamence, and Primal Kyogre sets lacking Thunder. Arceus-Water sets running Will-O-Wisp also have a decent matchup against Necrozma-DM and Mega Lucario, as it resists their Steel-type attacks and can burn them.
* Yveltal is a good offensive partner for Mega Diancie, since it threatens Necrozma-DM, Marshadow, and Mega Gengar. It also provides the team with a Ground immunity, which is crucial to have in a metagame dominated by Primal Groudon.
[STRATEGY COMMENTS]
Other Options
=============
Hidden Power Fire can be a nice surprise attack, potentially OHKOing Mega Scizor after Stealth Rock damage and 2HKOing Ferrothorn, which are both otherwise relatively unfazed by Mega Diancie's attacks. However, this can only be used when predicting either of these Pokemon switching in, as both of them are able to OHKO Mega Diancie.
* Calm Mind can be a useful move, as it boosts Mega Diancie's Special Attack and Special Defense by one stage, making it a lot harder to switch into and a lot harder for defensive teams to wear down, since Magic Bounce grants Mega Diancie an immunity to Taunt and status moves. However, Mega Diancie only really gets to take advantage of Calm Mind in matchups against stall, which, considering that Mega Diancie's best matchup is already against stall, makes it hard to justify over any of its other common moves.
* Protect can be used to allow Diancie to Mega Evolve without having to take any damage doing so. It can also be useful for scouting for super effective coverage moves. However, Diancie struggles to find the moveslot to run it, as it already struggles between the options of Heal Bell, Endeavor, and Stealth Rock.
* Magnet Rise can be useful for dealing with Primal Groudon, as Mega Diancie can then 2HKO it with Earth Power. However, most Pokemon with Ground-type attacks are still able to beat Mega Diancie in a one-on-one situation, as Zygarde is able to hit it with Thousand Arrows regardless and Arceus-Ground outspeeds it.
* Rock Polish can boost Mega Diancie's Speed, potentially giving it more offensive presence, and making it harder to be revenge killed by faster Pokemon in the tier such as Marshadow; however, Mega Diancie still faces the issues of failing to KO many of the Pokemon that threaten it, as Mega Lucario and Mega Scizor have access to priority Bullet Punch, and Necrozma-DM and Arceus-Ground can KO Mega Diancie in return. Rock Polish also prevents it from running more effective moves such as Stealth Rock and Heal Bell.
* Power Gem and a Timid nature can be run in place of Diamond Storm on a Calm Mind Set to make Mega Diancie a full special sweeper, but it should be noted that it struggles immensely against special walls, as it has to get to +6 in order to be able to 2HKO Chansey with Moonblast.
Checks and Counters
===================
**Steel-types**: Diancie has a 4x weakness to Steel-type attacks and therefore finds even the most passive of Steel-type Pokemon to be very threatening. Although Mega Diancie runs Earth Power or occasionally Hidden Power Fire as an attempt to combat Steel-type Pokemon, there are many Steel-types in the tier that are relatively unfazed by those moves, as they have a significant amount of natural bulk or a secondary typing that makes them take neutral damage from them. For example, Celesteela is a hard-counter to Mega Diancie, as it fails to 2HKO Celesteela, even if it opts to run Hidden Power Fire, and Celesteela can OHKO it in return with Heavy Slam to get a free Defense boost. Ferrothorn tends to run maximum Special Defense investment and therefore is barely even 2HKOed by Hidden Power Fire sets. Mega Scizor is also unfazed by Mega Diancie's attacks, with the exception of the rare Hidden Power Fire, and can OHKO Mega Diancie with priority Bullet Punch.
**Ground-types**: Both offensive and support variants of Arceus-Ground easily deal with Mega Diancie, as they are able to outspeed it and OHKO it with powerful STAB attacks. Primal Groudon is able to OHKO Mega Diancie with Precipice Blades, but it should be noted that it is 2HKOed by Earth Power. Zygarde-C is able to OHKO Mega Diancie with Thousand Arrows after Stealth Rock damage, but it needs to be in its Complete forme in order to be able to tank a Moonblast.
**Primal Kyogre**: Primal Kyogre has more than enough bulk to take any of Mega Diancie's hits and OHKO it with Origin Pulse.
**Arceus-Water and Arceus-Fairy**: Arceus-Water and Arceus-Fairy can Recover off damage taken from any of Mega Diancie's attacks and wear it down with Judgment or Ice Beam in Arceus-Water's case.
**Chansey**: Chansey has enough bulk thanks to its Eviolite to shrug off any attack from Mega Diancie with Soft-Boiled. It should be noted, though, that if it is not running Seismic Toss, it can't do anything back to Mega Diancie.
**Faster Attackers and Revenge Killers**: Faster attackers such as Marshadow, Ultra Necrozma, Mega Lucario, Arceus-Ground, and Choice Scarf Xerneas can all outspeed Mega Diancie and KO it with their hard-hitting attacks.
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