www.smogon.com/dp/pokemon/walrein
Partial edit, added a lot of new material including Team Options. Removed every other set and placed them in other options. The statistics shows that the other sets were near non-existent in the month of December. (4.9)
________________________________________________________________
[[OVERVIEW]
<p>As usual, the Ice-type is very much a mixed blessing. Ice-type attacks are always useful on a team, but the STAB boost on them comes with an unfortunate list of weaknesses. Stealth Rock hinders Walrein's ability to tank attacks, as taking 25% damage each time it comes in will wear it down fast. Even with these drawbacks considered, Walrein is a fine tank in OU play with handy resistances to Ice- and Water-type attacks and respectable offensive stats for a predominantly defensive Pokemon.</p>
<p>Back in ADV, the sight of Walrein in OU matches was rare, to say the least. However, with its cool new Ice Body ability, it can be a very useful—often integral—part of a hail-based team with support from Abomasnow. Walrein's stalling abilities with hail support are impressive and with Toxic or Toxic Spikes, it can be surprisingly difficult to take down. Overall, Walrein got some very useful boosts in the transition from ADV to DPP, making it suitable for use in the OU environment.</p>
[SET]
name: Stallrein (Toxic Stall)
move 1: Protect
move 2: Substitute
move 3: Toxic / Roar / Super Fang
move 4: Surf / Blizzard
item: Leftovers
ability: Ice Body
nature: Bold
evs: 220 HP / 252 Def / 36 SpD
[SET COMMENTS]
<p>This set is based around taking advantage of Walrein's Ice Body ability and using it to stall turns.This set needs to be partnered with Abomasnow to get a constant stream of hail going. With Ice Body activated and Leftovers equipped, Walrein can alternate between Substitute and Protect, without losing any health, forcing the opponent to suffer up to 32 turns of hail and other residual damage.</p>
<p>Poisoning the opponent is key to this set's success. Once Walrein has afflicted an opponent with Toxic, the stalling can commence. Simply alternate between Protect and Substitute (there is no net change in your health), healing yourself and intensifying the poison damage each turn, draining your opponent of its HP. This is the direct approach.There is another way to do this, however, but it requires some additional support. Adding a Toxic Spikes user such as Forretress or Tentacruel into the mix can really add to this set's effectiveness. Bear in mind that if you are unable to get both layers of Toxic Spikes in play, you will be inflicting the weaker variety of poison, making stalling the opponent out a slightly slower process.</p>
<p>With Toxic Spikes support, Walrein can afford to drop Toxic from its moveset. However, if you keep it, Walrein will be able to poison Flying-type Pokemon and Pokemon with Levitate. Other than Toxic, you have a couple of options to use in its place. Roar works if your team is in need of a phazer and also has applications more specific to this set. First of all, you can shuffle opponents around to let Toxic Spikes take effect. Secondly, you can prevent Swampert from Roaring your Substitute away by Roaring it out first. Having Roar also means that Gyarados cannot simply Dragon Dance in Walrein's face and forces it to take even more residual damage upon re-entry. Earthquake is a great choice to hit Poison-types like Tentacruel that like to ruin your set-up by coming in to absorb Toxic Spikes. It also helps to wear down Steel-types, which are immune to poison. Super Fang can also be used to slice the opponent’s HP in half. This ultimately makes the stalling process much faster with Toxic Spikes down. Finally, you have your choice of STAB move so Walrein's respectable Special Attack doesn't go to waste. Surf helps to wear down Tyranitar, whose ability to change the weather is a real pain. (add space) Surf also hits Steel-types for neutral damage and has the potential to 2HKO Forretress, whose immunity to Toxic and access to Rapid Spin can ruin Walrein's strategy. It also has a lot more PP than Blizzard, meaning that Walrein won't be quite so vulnerable to Taunt. Blizzard is still a worthy option, however, as it provides Walrein with good attacking coverage and smacks around most Flying-, Grass-, and Poison-types many of whom are immune to Toxic Spikes or the poison status altogether.</p>
[ADDITIONAL COMMENTS]
<p>As previously mentioned, Abomasnow is absolutely required in order to take full advantage of Walrein's ability. Since Walrein is normally used with hail, Abomasnow could support the entire team as a whole. Toxic Spikes will allow Walrein to more effectively stall out the opponent, so partnering Walrein with a user of them is a good strategy. Tentacruel and Forretress can reliably place down Toxic Spikes while also providing Rapid Spin support. Rapid Spin removes Stealth Rock from the field, allowing Walrein to come in without taking a quarter of its HP in damage.</p>
<p>220 HP EVs allow Walrein's HP stat to be divisible by 16, which guarantees that all of the damage it takes from using Substitute is restored in two turns. Speed EVs can be used on Walrein in order to foil some common phazers such as Skarmory and Vaporeon. However, this might reduce Walrein's overall physical tanking abilities, albeit not by too much.</p>
<p>Tyranitar gives Walrein a world of trouble by removing hail and packing high-powered Rock-type attacks. Swampert can keep Tyranitar at bay, and can also set up Stealth Rock for added residual damage. (add space) Choice Band Dugtrio is another option since it can trap and OHKO Tyranitar with Earthquake. Walrein's typing gives it an undesirable weakness to a number of commonly used attacks. Fighting-types who are immune to poison, such RestTalk Machamp, can beat Walrein with their STAB attacks. Gyarados can also be a problem with Taunt, an immunity to Toxic Spikes, and the ability to then set up on Walrein. Having a Rotom-A on your team will compensate for these issues extremely well. Rotom-A can check and beat Gyarados, take the Fighting-type attacks aimed at Walrein, and also block Rapid Spin attempts from Pokemon like Forretress.</p>
[Team Options]
<p>Abomasnow is required with Walrein to provide hail, which activates Walrein's near-exclusive ability, Ice Body. Toxic Spikes should be considered next as they allow Walrein to stall out the opponent. There are a number of candidates for setting up Toxic Spikes, but Tentacruel and Forretress are the best users with Walrein since they also have Rapid Spin to remove entry hazards. Tentacruel in particular adds a sweet Fighting-type resistance, along with having the ability to absorb Toxic Spikes just by switching in.</p>
<p>There is a special place in Walrein's private hell reserved for Tyranitar. Having a teammate that can beat Tyranitar is absolutely necessary, as otherwise Sand Stream will wreak havoc on Walrein. Swampert is a good Tyranitar switch-in that can also set up Stealth Rock for Walrein to abuse with Roar. Rotom-A can lure out Tyranitar earlier in the match and burn it with Will-O-Wisp, effectively neutering its offensive presence and putting it on a timer. Rotom-A also checks Gyarados, which can come into Walrein and set up if carrying Taunt. Durable Fighting-type Pokemon of your own, such as RestTalk Machamp, can also switch in and support Walrein with their massive offensive presence.</p>
[Optional Changes]
<p>Walrein has a few options worth noting from its respectably diverse movepool. Stockpile is available if you wish to boost both of Walrein's defenses, although Walrein has better things to be doing. Hidden Power Electric works okay alongside Blizzard, hitting Water-types for reasonable damage, especially Gyarados. Walrein can run a RestTalk set with Thick Fat, but its poor defensive typing and weakness to Stealth Rock make the set's viability questionable. Walrein can also run a Curse set to further boost its decent Attack and Defense, but Snorlax and Swampert do this job better. The only distinct advantage Walrein has over the former two is that nothing is immune to Avalanche. Lastly, Encore can be used to force switches and set up on the opponent's Pokemon. Roar is probably the better option, though, since it has more PP and can bring out something Walrein fares well against. Thick Fat can replace Ice Body pretty much anywhere, but then you're better off using other bulky Water-type Pokemon such as Vaporeon or Suicune. Brine is also a nice attacking move in tandem with Super Fang.</p>
[Counters]
<p>Since Walrein relies on poison to deal damage, most Steel-types will cause problems. Jirachi and Metagross have the defenses to take a few hits even from Earthquake and strike back with powerful attacks of their own. Empoleon can beat it down with Grass Knot and also resists Water-type attacks, making switching in a little easier. Empoleon can also Roar away Walrein's Substitute, but rarely has enough Speed EVs to ensure it will phaze Walrein before being phazed itself. If they come in before Walrein sets up a Substitute, Lucario and Machamp can scare away Walrein with their high-powered STAB moves.</p>
<p>Tyranitar screws up Walrein's Leftovers recovery and replaces hail with sandstorm, making Ice Body useless. Gyarados can sponge hits from Ice- and Water-type attacks and set up with Dragon Dance before KOing Walrein with Stone Edge. Like Tyranitar, Gyarados also has access to Taunt. Suicune is faster than Walrein, can easily Roar it out, and takes minimal damage from any of the Walrein's attacks. Clefable is immune to the effects of hail and poison and can Encore Walrein's attacks, making it particularly problematic despite being rare in OU. Breloom is another issue if you don't have Blizzard, since it, like Clefable, is still able to recover HP during hail and can't be worn down by poison, thanks to its Poison Heal ability.</p>



Partial edit, added a lot of new material including Team Options. Removed every other set and placed them in other options. The statistics shows that the other sets were near non-existent in the month of December. (4.9)
________________________________________________________________
[[OVERVIEW]
<p>As usual, the Ice-type is very much a mixed blessing. Ice-type attacks are always useful on a team, but the STAB boost on them comes with an unfortunate list of weaknesses. Stealth Rock hinders Walrein's ability to tank attacks, as taking 25% damage each time it comes in will wear it down fast. Even with these drawbacks considered, Walrein is a fine tank in OU play with handy resistances to Ice- and Water-type attacks and respectable offensive stats for a predominantly defensive Pokemon.</p>
<p>Back in ADV, the sight of Walrein in OU matches was rare, to say the least. However, with its cool new Ice Body ability, it can be a very useful—often integral—part of a hail-based team with support from Abomasnow. Walrein's stalling abilities with hail support are impressive and with Toxic or Toxic Spikes, it can be surprisingly difficult to take down. Overall, Walrein got some very useful boosts in the transition from ADV to DPP, making it suitable for use in the OU environment.</p>
[SET]
name: Stallrein (Toxic Stall)
move 1: Protect
move 2: Substitute
move 3: Toxic / Roar / Super Fang
move 4: Surf / Blizzard
item: Leftovers
ability: Ice Body
nature: Bold
evs: 220 HP / 252 Def / 36 SpD
[SET COMMENTS]
<p>This set is based around taking advantage of Walrein's Ice Body ability and using it to stall turns.This set needs to be partnered with Abomasnow to get a constant stream of hail going. With Ice Body activated and Leftovers equipped, Walrein can alternate between Substitute and Protect, without losing any health, forcing the opponent to suffer up to 32 turns of hail and other residual damage.</p>
<p>Poisoning the opponent is key to this set's success. Once Walrein has afflicted an opponent with Toxic, the stalling can commence. Simply alternate between Protect and Substitute (there is no net change in your health), healing yourself and intensifying the poison damage each turn, draining your opponent of its HP. This is the direct approach.There is another way to do this, however, but it requires some additional support. Adding a Toxic Spikes user such as Forretress or Tentacruel into the mix can really add to this set's effectiveness. Bear in mind that if you are unable to get both layers of Toxic Spikes in play, you will be inflicting the weaker variety of poison, making stalling the opponent out a slightly slower process.</p>
<p>With Toxic Spikes support, Walrein can afford to drop Toxic from its moveset. However, if you keep it, Walrein will be able to poison Flying-type Pokemon and Pokemon with Levitate. Other than Toxic, you have a couple of options to use in its place. Roar works if your team is in need of a phazer and also has applications more specific to this set. First of all, you can shuffle opponents around to let Toxic Spikes take effect. Secondly, you can prevent Swampert from Roaring your Substitute away by Roaring it out first. Having Roar also means that Gyarados cannot simply Dragon Dance in Walrein's face and forces it to take even more residual damage upon re-entry. Earthquake is a great choice to hit Poison-types like Tentacruel that like to ruin your set-up by coming in to absorb Toxic Spikes. It also helps to wear down Steel-types, which are immune to poison. Super Fang can also be used to slice the opponent’s HP in half. This ultimately makes the stalling process much faster with Toxic Spikes down. Finally, you have your choice of STAB move so Walrein's respectable Special Attack doesn't go to waste. Surf helps to wear down Tyranitar, whose ability to change the weather is a real pain. (add space) Surf also hits Steel-types for neutral damage and has the potential to 2HKO Forretress, whose immunity to Toxic and access to Rapid Spin can ruin Walrein's strategy. It also has a lot more PP than Blizzard, meaning that Walrein won't be quite so vulnerable to Taunt. Blizzard is still a worthy option, however, as it provides Walrein with good attacking coverage and smacks around most Flying-, Grass-, and Poison-types many of whom are immune to Toxic Spikes or the poison status altogether.</p>
[ADDITIONAL COMMENTS]
<p>As previously mentioned, Abomasnow is absolutely required in order to take full advantage of Walrein's ability. Since Walrein is normally used with hail, Abomasnow could support the entire team as a whole. Toxic Spikes will allow Walrein to more effectively stall out the opponent, so partnering Walrein with a user of them is a good strategy. Tentacruel and Forretress can reliably place down Toxic Spikes while also providing Rapid Spin support. Rapid Spin removes Stealth Rock from the field, allowing Walrein to come in without taking a quarter of its HP in damage.</p>
<p>220 HP EVs allow Walrein's HP stat to be divisible by 16, which guarantees that all of the damage it takes from using Substitute is restored in two turns. Speed EVs can be used on Walrein in order to foil some common phazers such as Skarmory and Vaporeon. However, this might reduce Walrein's overall physical tanking abilities, albeit not by too much.</p>
<p>Tyranitar gives Walrein a world of trouble by removing hail and packing high-powered Rock-type attacks. Swampert can keep Tyranitar at bay, and can also set up Stealth Rock for added residual damage. (add space) Choice Band Dugtrio is another option since it can trap and OHKO Tyranitar with Earthquake. Walrein's typing gives it an undesirable weakness to a number of commonly used attacks. Fighting-types who are immune to poison, such RestTalk Machamp, can beat Walrein with their STAB attacks. Gyarados can also be a problem with Taunt, an immunity to Toxic Spikes, and the ability to then set up on Walrein. Having a Rotom-A on your team will compensate for these issues extremely well. Rotom-A can check and beat Gyarados, take the Fighting-type attacks aimed at Walrein, and also block Rapid Spin attempts from Pokemon like Forretress.</p>
[Team Options]
<p>Abomasnow is required with Walrein to provide hail, which activates Walrein's near-exclusive ability, Ice Body. Toxic Spikes should be considered next as they allow Walrein to stall out the opponent. There are a number of candidates for setting up Toxic Spikes, but Tentacruel and Forretress are the best users with Walrein since they also have Rapid Spin to remove entry hazards. Tentacruel in particular adds a sweet Fighting-type resistance, along with having the ability to absorb Toxic Spikes just by switching in.</p>
<p>There is a special place in Walrein's private hell reserved for Tyranitar. Having a teammate that can beat Tyranitar is absolutely necessary, as otherwise Sand Stream will wreak havoc on Walrein. Swampert is a good Tyranitar switch-in that can also set up Stealth Rock for Walrein to abuse with Roar. Rotom-A can lure out Tyranitar earlier in the match and burn it with Will-O-Wisp, effectively neutering its offensive presence and putting it on a timer. Rotom-A also checks Gyarados, which can come into Walrein and set up if carrying Taunt. Durable Fighting-type Pokemon of your own, such as RestTalk Machamp, can also switch in and support Walrein with their massive offensive presence.</p>
[Optional Changes]
<p>Walrein has a few options worth noting from its respectably diverse movepool. Stockpile is available if you wish to boost both of Walrein's defenses, although Walrein has better things to be doing. Hidden Power Electric works okay alongside Blizzard, hitting Water-types for reasonable damage, especially Gyarados. Walrein can run a RestTalk set with Thick Fat, but its poor defensive typing and weakness to Stealth Rock make the set's viability questionable. Walrein can also run a Curse set to further boost its decent Attack and Defense, but Snorlax and Swampert do this job better. The only distinct advantage Walrein has over the former two is that nothing is immune to Avalanche. Lastly, Encore can be used to force switches and set up on the opponent's Pokemon. Roar is probably the better option, though, since it has more PP and can bring out something Walrein fares well against. Thick Fat can replace Ice Body pretty much anywhere, but then you're better off using other bulky Water-type Pokemon such as Vaporeon or Suicune. Brine is also a nice attacking move in tandem with Super Fang.</p>
[Counters]
<p>Since Walrein relies on poison to deal damage, most Steel-types will cause problems. Jirachi and Metagross have the defenses to take a few hits even from Earthquake and strike back with powerful attacks of their own. Empoleon can beat it down with Grass Knot and also resists Water-type attacks, making switching in a little easier. Empoleon can also Roar away Walrein's Substitute, but rarely has enough Speed EVs to ensure it will phaze Walrein before being phazed itself. If they come in before Walrein sets up a Substitute, Lucario and Machamp can scare away Walrein with their high-powered STAB moves.</p>
<p>Tyranitar screws up Walrein's Leftovers recovery and replaces hail with sandstorm, making Ice Body useless. Gyarados can sponge hits from Ice- and Water-type attacks and set up with Dragon Dance before KOing Walrein with Stone Edge. Like Tyranitar, Gyarados also has access to Taunt. Suicune is faster than Walrein, can easily Roar it out, and takes minimal damage from any of the Walrein's attacks. Clefable is immune to the effects of hail and poison and can Encore Walrein's attacks, making it particularly problematic despite being rare in OU. Breloom is another issue if you don't have Blizzard, since it, like Clefable, is still able to recover HP during hail and can't be worn down by poison, thanks to its Poison Heal ability.</p>