Regice

Clear Body
Stops the enemy from lowering this Pokémon's stats.
Type Tier
Ice OU
Statistics
Min- Min Max Max+
HP
80
- 301 364 -
Atk
50
122 136 199 218
Def
100
212 236 299 328
SpA
100
212 236 299 328
SpD
200
392 436 499 548
Spe
50
122 136 199 218
Name Item Nature

Standard

Leftovers Calm / Bold
Moveset EVs
~ Ice Beam
~ Thunderbolt
~ Psych Up / Thunder Wave / Counter
~ Rest
252 HP / 96 Def / 140 SpA / 20 Spe

Standard. It has the oh-so-famous Boltbeam combo, so it can hit anything not named Magneton (even though STAB Ice Beam hurts Magneton a lot), Lanturn, and Shedinja at least neutral. Moreover, STAB on Ice Beam may help killing some things. Psych Up helps slow down threats like Raikou and Calm Mind Celebi so they don't sweep as easily. Regice can also Thunder Wave things, setting up slower sweepers for teams that need a bit of Paralysis support. Counter can catch a lot of things off-guard: Regice's HP and Defense are high enough to take a hit and Counter it right back. Don't try to survive Metagross Meteor Mashes with this though, if you're into that you may want to look into the next set.

Name Item Nature

Curse / Counter

Leftovers Relaxed
Moveset EVs
~ Ice Beam
~ Curse
~ Counter
~ Explosion
252 HP / 108 Atk / 148 Def

This set is for more advanced players who are up to surprise their opponents. It should take care of popular starters like Zapdos and Salamence easily. They will be scared off and hopefully bring in Metagross. Curse on the switch, and then Counter the Meteor Mash. Even if it's Choice Banded, you will survive, and Metagross won't. Ice Beam is there for STAB, and Explosion OHKOs Snorlax and Blissey after one Curse. A fun set to use, but not very suitable for countering things like Suicune, Celebi and Gyarados, which the standard Regice has no troubles with.

Name Item Nature

Substitute / Focus Punch

Leftovers Brave / Quiet
Moveset EVs
~ Substitute
~ Focus Punch
~ Ice Beam
~ Thunderbolt
204 HP / 252 Atk / 52 SpA

Another surprise set. Ice Beam and Thunderbolt scare off things as per usual, but the catch here is Focus Punch. With the EVs listed and Brave, you will always 2HKO Blissey with Focus Punch. Quiet slims the chance slightly, so it can be hard to fight Blissey with that, especially if it has Toxic or Thunder Wave. Focus Punch usually OHKOs Tyranitar, and also puts a decent dent in Snorlax, but if it Curses up against you, Regice should retreat.

This Regice needs Wish support to stay alive against the likes of Gyarados, especially since it cuts its own HP by 25% every time it uses Substitute. Like the previous set, not recommended if you need Regice as a wall.

Other Options

Toxic abuses Regice's stalling nature. Seismic Toss can be used as a Substitute for Psych Up to beat Raikou, as well as doing a bit more to Metagross switch-ins, same for Earthquake.

Hidden Power Fire can hit Metagross decently hard on the switch, as well as nailing Scizor and Forretress, but its primary purpose is to beat Substitute Jirachi, in conjunction with Psych Up. Without any Special Attack EVs, Regice will always break Jirachi's Substitute with Hidden Power Fire, barring uneven Calm Mind distribution. You still don't stop Wish Jirachi, however, unless you can get a Critical Hit after Psyching Up a few Calm Minds.

Zap Cannon or Thunder can be used for Paralysis, but you can have a lot of trouble against Gyarados who decides to stay in and go for the 2HKO with Dragon Danced Hidden Power Flying / Hidden Power Rock. Sleep Talk keeps Salamence and co. from setting up as you Rest, and helps Regice absorb Sleep moves like Sleep Powder.

EVs

Bold with Max HP, a few Speed EVs (at least 20 EVs are needed to outspeed most -Speed Swampert), with the rest into Special Attack. Calm is also an option if you want its godly Special Defense stat any higher. Never put any EVs into Regice's Special Defense before maxing HP, and even then, the difference between no EVs and 252 EVs in Special Defense is only 14%, a paltry sum. Modest can be used to make Regice a special sweeper with that great STAB Ice Beam and Thunderbolt.

Opinion

Regice is a good Special tank, maybe not as good as Blissey, but it's still good. It has great Special Defense, but the HP and Defense aren't enough to take hits easily. Nonetheless, Regice is a good Pokémon overall.

Regice can be used to counter Dragon Dance Salamence in a pinch, as it survives anything Salamence throws at it, but watch out for Rock Slide flinch. It counters Gyarados even better, as Thunderbolt OHKOs, and there's no risk of a Rock Slide flinch.

Regice does beat Blissey 1v1, but you have to PP stall it with Rest, which takes a while. Regice has the advantage over Blissey of beating Dugtrio easier, as it gets STAB on Ice Beam, but other than that, Softboiled, Natural Cure, and Aromatherapy generally make Blissey preferred. STAB Ice Beam in combination with Thunderbolt is really nice, though.

It should be noted however, that constantly switching in Regice into Zapdos or Raikou Thunderbolts (both do about 25%), especially when Sandstorm is in effect, will cause Regice to take a lot of damage.

Counters

Snorlax beats the standard Regice most of the time. It can Curse up, and even if Regice has Psych Up it will win with a critical hit in the long run. Focus Punch may hurt it, and Explosion can kill, but most of the time you will face standard Ice Beam / Thunderbolt versions, which doesn't do jack to Snorlax's Thick Fat, high Special Defense and immense HP.

Blissey can wall Regice in the same way, and has to watch out even more for Explosion and Focus Punch. However, if Regice has Rest, Regice will win the stall war. Blissey can force Regice to Rest, then switch out to a strong Rock Slider like Aerodactyl or Salamence to scare him off though.

Entei resists Ice Beam, can Calm Mind up and use STAB Fire attacks to blow Regice away. Even if Regice has Psych Up, Entei will win the war. Toxic or Thunder Wave will hinder Entei, so Entei will have to use Substitute (or possibly Rest) to block those.

Metagross is the best counter in the game, especially Rest / Sleep Talk Metagross. Barring Curse variants, Regice will never survive Choice Banded Meteor Mashes, and as long as you don't get Countered, non-Choice Banded Meteor Mashes will hurt it greatly. Metagross resists Ice Beam, doesn't take too much damage from Thunderbolt and is immune to Toxic. You may find it annoying to have Metagross paralyzed by Thunder Wave though, but it's slower than most enemies already, so it's mostly vs. Snorlax and when you are Fully Paralyzed that it matters.

Tyranitar can hurt Regice greatly with STAB Rock Slides, but doesn't take those STAB Ice Beams too lightly, and doesn't enjoy Toxics and Thunder Waves either.