Omastar

Swift Swim
Speed doubles in rain.
Shell Armor
Prevents critical hits.
Weak Armor
Boosts Speed by 1 stage and lowers Defense by 1 stage when hit by a physical move.
Type Tier
Rock / Water RU
Level 100 Statistics (see level 5, 50, 100)
Min- Min Max Max+
HP
70
- 281 344 -
Atk
60
140 156 219 240
Def
125
257 286 349 383
SpA
115
239 266 329 361
SpD
70
158 176 239 262
Spe
55
131 146 209 229

Overview

Thanks to its high Special Attack stat, Omastar has always been a decent Rain Dance sweeper; however, it is let down by its poor Speed and many weaknesses courtesy of its secondary Rock typing. For these reasons, Omastar was more often used as a hazard setter; it is one of the few Pokemon with access to all three of Stealth Rock, Spikes, and Toxic Spikes. BW, though, has blessed Omastar with one of the best setup moves in the entire game—Shell Smash. A move that sharply raises Attack, Special Attack, and Speed, Shell Smash was distributed to only a few select users, among whom Omastar is one of the best, because of its excellent Special Attack. Shell Smash also patches up any Speed issues that Omastar previously had, making this shellfish one of the most threatening sweepers around.

Name Item Ability Nature

Shell Smash

Life Orb / White Herb Shell Armor Modest / Timid
Moveset EVs
~ Shell Smash
~ Hydro Pump / Surf
~ Ice Beam
~ Hidden Power Grass
4 Def / 252 SpA / 252 Spe

With a single turn of setup, Shell Smash Omastar can gain essentially a Nasty Plot and an Agility boost at the same time, and instantly turn into a deadly sweeper. Hydro Pump is the preferred STAB move, as it puts absolutely massive dents in anything that doesn't resist it. Surf is a reliable alternative with less power but perfect accuracy and more PP. Ice Beam is a great coverage move and hits Grass-types hard, especially after a boost. The final move should be Hidden Power Grass, which hits other Water-types such as Suicune and Milotic, as well as Water Absorb Quagsire, who is immune to Water-type attacks.

Team Options & Additional Comments >>>
Name Item Ability Nature

Support

Leftovers Shell Armor Bold
Moveset EVs
~ Stealth Rock / Toxic Spikes
~ Spikes / Stealth Rock
~ Scald
~ Ice Beam
248 HP / 252 Def / 8 SpD

Omastar has an amazing Defense stat, and despite its several crippling weaknesses, it can check some of the most dangerous threats in the game, such as Victini and Arcanine. In addition, Omastar is the only Pokemon in UU with access to all three entry hazards, though only two are recommended at any given time. Scald is a STAB move with a nice 30% chance to burn, crippling all physical attackers except for those with the Guts ability. Ice Beam is the primary move in the last moveslot to discourage Grass-types from wantonly switching in.

Team Options & Additional Comments >>>

Other Options

Earth Power is another option for coverage, but is somewhat redundant with Omastar's other moves. AncientPower is Omastar's only viable secondary special STAB, but is weak, has low PP, and also provides redundant coverage. Haze is an option on the support set, but such a move is better left to Pokemon such as Milotic, which has access to instant recovery. Chople Berry prevents TechniTop's Mach Punch from OHKOing Shell Smash Omastar after a Defense drop, but it is usually not worth the drop in power. Knock Off is a great option on the support set to ruin Pokemon highly dependent on their items. Finally, Omastar receives Weak Armor from the Dream World, but it is highly situational, and Shell Armor or Swift Swim is much better in almost every single instance.

Checks and Counters

Due to Omastar's fantastic offensive capabilities, Empoleon is the only opponent that can actually wall it. While even Empoleon must watch out for the rare Hidden Power Electric, specially defensive variants can survive a +2 Hidden Power Electric and KO back with Grass Knot. However, Empoleon cannot directly switch into +2 Hidden Power Electric. Hidden Power Grass Milotic can survive a boosted, super effective Hidden Power and KO back, but it is a risky check at best: as it might be 2HKOed after Stealth Rock, it cannot directly switch into a super effective Hidden Power. Faster Choice Scarf users and priority users, such as Raikou and Hitmontop, can easily take Omastar out, as they either outspeed Omastar even after a boost, or completely bypass its Speed with priority.