After some experimentation, I was suggested a team made around Mega Garchomp and it worked pretty well but in recent times I've used it, I have had a hard time using it because one of the pokemon would become dead weight in some battles so I reworked it myself and this is what I came up with. I did base it on the original team I was suggested though

Garchomp-Mega @ Garchompite
Ability: Sand Force
Shiny: No
EVs: 4 Atk / 252 SpA / 252 Spe
Mild Nature
- Draco Meteor
- Stealth Rock
- Earthquake
- Fire Blast
Starting things off is the star of the team, Mega Garchomp. At first, I was skeptical about using a mild nature over naive but after some battles, it really proved its worth. Just a standard mixed Mega Chomp set meant to hit as many things as hard as possible. This is the first member of the hazard trio of the team and because how Mega Chomp threaten many pokemon, it's one of the perfect candidates for using stealth rock. Not much to say since it is just the usual set

Toxapex @ Black Sludge
Ability: Regenerator
Shiny: Yes
EVs: 248 HP / 180 Def / 80 SpD
Calm Nature
- Haze
- Scald
- Recover
- Toxic Spikes
The second and main member of the hazard. I say main member because toxic spikes is a very powerful hazard. Putting opposing pokemon on a timer even with just one layer of poison can put them in range of some strong attacks like Garchomp's draco meteor. I always prioritize getting toxic spikes up over rocks unless the opponent has Charizard. The ev spread and nature is a bit weird but like in my previous rmt, I don't want it to be too vulnerable on the special side

Ferrothorn @ Leftovers
Ability: Iron Barbs
Shiny: Yes
EVs: 252 HP / 48 Def / 208 SpD
Careful Nature
- Spikes
- Protect
- Gyro Ball
- Leech Seed
The final member of the hazard trio. When using spikes, Ferrothorn is probably one, if not, the best user of the move. Spikes is the least important hazard on this team and it's job is to whittle down steel types like Magearna, who would otherwise survive Mega Garchomp's earthquakes from full hp and kill it back with fleur cannon. Protect is a move for scouting and gyro ball is my choice of stab so it can threaten fairies on its own. Leech seed is there because seed and Ferrothorn go together like burgers and fries

Greninja-Ash @ Choice Specs
Ability: Battle Bond
Shiny: No
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Ice Beam
- Dark Pulse
- Hydro Pump
- Water Shuriken
Next is the main sweeper of the team. Since Ferrothorn already has spikes, I gave Greninja ice beam for a nasty surprise against grass types. Because it is Ash Greninja, its other moves remain the same along with the nature, evs and item. With the help of the hazard trio, it should force the opponent to use defog more often and that means I can bring in Greninja to hit something hard, possibly scoring the battle bond activation early and thus, giving me a powerful revenge killer. The coverage from ice beam should make things a lot easier because of the coverage it provides

Tapu Koko @ Electrium Z
Ability: Electric Surge
Shiny: Yes
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Roost
- U-turn
- Thunderbolt
- Dazzling Gleam
For this member, I'm not exactly sure if its the best one. The main reason I chose Tapu Koko was to deny an opposing Tapu Lele's psychic terrain, which would prevent Greninja from using water shuriken. When I tried it in a few battles, Koko performed good, sometimes even too good since it seems to be a pokemon made for my playstyle. Recovery option and a powerful stab in thunderbolt. Even though it's special attack is not that great, under electric terrain, it hurts. Since Greninja already had the ice type coverage, I chose to forgo it and replace it with u turn on Koko and since my z crystal slot was still open, I gave it to Koko. It does come at the cost of losing life orb damage but it still performs decently. I chose the electric z crystal over the fairy one because of Volcarona and Charizard. In the event that I failed my prediction and let my opponent defog away the rocks, I wanted a nuke that could hit them real hard, even if it means that Koko must be sacrificed just so they would put them in range of a pre battle bond water shuriken, which is completely unreliable

Tornadus-Therian @ Rocky Helmet
Ability: Regenerator
Shiny: No
EVs: 252 HP / 4 Def / 252 Spe
Timid Nature
- Defog
- U-turn
- Hurricane
- Knock Off
For the last member, I needed a pokemon with the regenerator ability in specific. The reason for this is I wanted a pokemon that could scout a choice locked opponent pokemon to ease prediction. Most unboosted coverage attacks do not kill Tornadus from full hp unless it is a crit. Thus, it's main role is to scout the moves so I can react accordingly. I know Tornadus is a good z user, but for my play style, it is more useful to me in the role I just mentioned, as a scout. It also comes with the benefit of defog which my team doesn't really need that much but good to have nonetheless. This set has proven itself to be a lot more consistent with me than the z crystal set. That is why I gave the crystal to Koko instead
After a few battles, this team performs rather good but I have this feeling that something is off about it and that it can be improved so any help would be appreciated. One of the main reasons I even wanted to change the team I was suggested was because I really wanted to have a team with Ash Greninja and Mega Garchomp
This team does struggle a lot against Kingdra in the rain though as choice specs, rain boosted hydro pumps puts a massive dent in even Ferrothorn. And if the thorn gets injured by it, then even the pex will get hammered by it even more. Now that I think about it, this is the main reason I wanted some feedback on the team

Garchomp-Mega @ Garchompite
Ability: Sand Force
Shiny: No
EVs: 4 Atk / 252 SpA / 252 Spe
Mild Nature
- Draco Meteor
- Stealth Rock
- Earthquake
- Fire Blast
Starting things off is the star of the team, Mega Garchomp. At first, I was skeptical about using a mild nature over naive but after some battles, it really proved its worth. Just a standard mixed Mega Chomp set meant to hit as many things as hard as possible. This is the first member of the hazard trio of the team and because how Mega Chomp threaten many pokemon, it's one of the perfect candidates for using stealth rock. Not much to say since it is just the usual set

Toxapex @ Black Sludge
Ability: Regenerator
Shiny: Yes
EVs: 248 HP / 180 Def / 80 SpD
Calm Nature
- Haze
- Scald
- Recover
- Toxic Spikes
The second and main member of the hazard. I say main member because toxic spikes is a very powerful hazard. Putting opposing pokemon on a timer even with just one layer of poison can put them in range of some strong attacks like Garchomp's draco meteor. I always prioritize getting toxic spikes up over rocks unless the opponent has Charizard. The ev spread and nature is a bit weird but like in my previous rmt, I don't want it to be too vulnerable on the special side

Ferrothorn @ Leftovers
Ability: Iron Barbs
Shiny: Yes
EVs: 252 HP / 48 Def / 208 SpD
Careful Nature
- Spikes
- Protect
- Gyro Ball
- Leech Seed
The final member of the hazard trio. When using spikes, Ferrothorn is probably one, if not, the best user of the move. Spikes is the least important hazard on this team and it's job is to whittle down steel types like Magearna, who would otherwise survive Mega Garchomp's earthquakes from full hp and kill it back with fleur cannon. Protect is a move for scouting and gyro ball is my choice of stab so it can threaten fairies on its own. Leech seed is there because seed and Ferrothorn go together like burgers and fries

Greninja-Ash @ Choice Specs
Ability: Battle Bond
Shiny: No
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Ice Beam
- Dark Pulse
- Hydro Pump
- Water Shuriken
Next is the main sweeper of the team. Since Ferrothorn already has spikes, I gave Greninja ice beam for a nasty surprise against grass types. Because it is Ash Greninja, its other moves remain the same along with the nature, evs and item. With the help of the hazard trio, it should force the opponent to use defog more often and that means I can bring in Greninja to hit something hard, possibly scoring the battle bond activation early and thus, giving me a powerful revenge killer. The coverage from ice beam should make things a lot easier because of the coverage it provides

Tapu Koko @ Electrium Z
Ability: Electric Surge
Shiny: Yes
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Roost
- U-turn
- Thunderbolt
- Dazzling Gleam
For this member, I'm not exactly sure if its the best one. The main reason I chose Tapu Koko was to deny an opposing Tapu Lele's psychic terrain, which would prevent Greninja from using water shuriken. When I tried it in a few battles, Koko performed good, sometimes even too good since it seems to be a pokemon made for my playstyle. Recovery option and a powerful stab in thunderbolt. Even though it's special attack is not that great, under electric terrain, it hurts. Since Greninja already had the ice type coverage, I chose to forgo it and replace it with u turn on Koko and since my z crystal slot was still open, I gave it to Koko. It does come at the cost of losing life orb damage but it still performs decently. I chose the electric z crystal over the fairy one because of Volcarona and Charizard. In the event that I failed my prediction and let my opponent defog away the rocks, I wanted a nuke that could hit them real hard, even if it means that Koko must be sacrificed just so they would put them in range of a pre battle bond water shuriken, which is completely unreliable

Tornadus-Therian @ Rocky Helmet
Ability: Regenerator
Shiny: No
EVs: 252 HP / 4 Def / 252 Spe
Timid Nature
- Defog
- U-turn
- Hurricane
- Knock Off
For the last member, I needed a pokemon with the regenerator ability in specific. The reason for this is I wanted a pokemon that could scout a choice locked opponent pokemon to ease prediction. Most unboosted coverage attacks do not kill Tornadus from full hp unless it is a crit. Thus, it's main role is to scout the moves so I can react accordingly. I know Tornadus is a good z user, but for my play style, it is more useful to me in the role I just mentioned, as a scout. It also comes with the benefit of defog which my team doesn't really need that much but good to have nonetheless. This set has proven itself to be a lot more consistent with me than the z crystal set. That is why I gave the crystal to Koko instead
After a few battles, this team performs rather good but I have this feeling that something is off about it and that it can be improved so any help would be appreciated. One of the main reasons I even wanted to change the team I was suggested was because I really wanted to have a team with Ash Greninja and Mega Garchomp
This team does struggle a lot against Kingdra in the rain though as choice specs, rain boosted hydro pumps puts a massive dent in even Ferrothorn. And if the thorn gets injured by it, then even the pex will get hammered by it even more. Now that I think about it, this is the main reason I wanted some feedback on the team
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