[Overview] <p>Walrein is a powerful staller that has proven its worth in RU. It has excellent bulk with its 110 / 90 / 90 defenses, and has a great defensive ability in the form of Ice Body. Ice Body, when combined with Leftovers, allows Walrein to recover the HP lost from using Substitute in a span of two turns. However, Walrein has some defensive faults; it sports a typing that leaves it with four weaknesses and only two resistances, a weakness to Stealth Rock, and a limited movepool . Walrein requires Rapid Spin support due to its vulnerability to Stealth Rock and Toxic Spikes. Despite its numerous flaws, Walrein can, without a doubt, become a deadly staller in the right hands.</p> [SET] name: Stallrein move 1: Protect move 2: Substitute move 3: Blizzard / Surf move 4: Super Fang / Toxic / Roar item: Leftovers ability: Ice Body nature: Bold EVs: 232 HP / 252 Def / 24 SpD [SET COMMENTS] <p>The EVs are incredibly important to this set. 232 HP EVs give Walrein a healthy 419 HP, the 252 Defense EVs along with a Bold nature maximize Walrein's Defense, and the remaining 24 EVs are placed into Special Defense for some special bulk. 419 HP is very important, as in two turns, Ice Body and Leftovers can recover the total HP lost from Substitute. This allows Walrein to continuously spam Substitute and Protect, but Walrein only has 32 turns to use this strategy . For this set to function at all, you need hail support, making Snover a necessity, due to its ability, Snow Warning. If you use Toxic, just keep using Substitute and Protect to stall for enough poison and hail damage, and KO them with either Blizzard or Surf . Walrein's base 95 Special Attack works in its favor, as it allows an effective use of Walrein's STAB attacks. Blizzard is a superior choice due to its higher Base Power and better coverage, although Surf can hit Steels that are immune to Toxic, and has more PP. Super Fang requires a similar strategy: Set up Substitute and Protect, and keep using Super Fang until your foe is within KO range. Roar, yet another option, is much better when used in conjunction with entry hazards such as Toxic Spikes. Roar can also be used to help prevent being set up on, as Pokemon such as Poliwrath will ruin your fun with Encore.</p> [ADDITIONAL COMMENTS] <p>To make a long story short, Walrein needs a healthy amount of support to be successful. If you use Roar or Super Fang, then Toxic Spikes are an excellent choice to cripple the opponent's team. Roselia makes a great partner; not only can it provide Toxic Spikes, but it can switch into the Electric- and Grass-type attacks that Walrein is weak to . Rapid Spin support is also helpful; Claydol is an excellent Rapid Spinner as it shares great defensive synergy with Walrein, and has access to Stealth Rock. Cryogonal can be partnered with Walrein as it can take advantage of the hail, and it also has access to Rapid Spin and Recover. Dugtrio is a good partner, as it deals with annoying Steel and Poison-types, and send them back to where they came from, as well as provide Stealth Rock support.</p> [Other Options] <p>Sadly, Walrein doesn't have many other options, due to its very limited movepool. You could run a RestTalk set to remedy Walrein's lack of recovery, or use Yawn to force switches and inflict sleep, but other than the options already mentioned, Walrein is a one trick walrus. </p> [Checks and counters] <p>Any Pokemon that is immune to Toxic and not weak to Ice- or Water-type attacks is an ideal counter. That being said, Muk provides a Toxic immunity and a neutrality to Walrein's STAB moves. There are many Steel-types in RU such as Ferroseed that easily wall Walrein. Most bulky Water-types give Walrein a hard time as well. Lanturn resists both of Walrein's STAB attacks, and has its super effective, Electric-type STAB to use against it. In addition phazers keep Walrein from setting up. Hariyama makes a good counter with its super effective, Fighting-type STAB attacks, and Guts variants can abuse the Attack boost from Toxic and beat down Walrein. Another ideal counter is Drapion, as it can switch into Toxic Spikes, is immune to Toxic, has decent Special Defense, and it can just Whirlwind Walrein out, or Taunt it. Specially defensive-inclined Pokemon such as Clefable can easily withstand an uninvested Blizzard or Surf. Pokemon with Taunt prevent it from setting up and force it to switch out. Encore not only prevents you from setting up, but lets the opponent set up. Status destroys Walrein; burn and poison wither away your HP, while paralysis takes away the little Speed you already have. Toxic Spikes discourages you from switching Walrein in, as it essentially neuters the stalling strategy.</p> [Dream World] <p>Walrein got nothing useful from the Dream World. Its Dream World ability is Oblivious, which prevents attraction; you'd be lucky if this was ever used at all in any tier. It is totally outclassed by Ice Body. Oblivious is never, in any case, viable. Don’t use it.