What type is Omastar?

Omastar is a dual Rock/Water type Pokémon.

What is Omastar weak to?

Omastar is Rock/Water. It takes 4× from Grass and 2× from Electric, Fighting and Ground.

No. 0139 · Gen 1

Modest: Hits harder and drops Attack, which it won’t use.

Hit OMASTAR with Grass for 4× damage. Electric, Fighting and Ground also deal 2×.

4×Hits hardest

2×Super effective

½×Not very effective

¼×Barely scratches it

In Pokémon GO: Grass deals 2.56× instead of 4×. GO chart

ModestHits harder and drops Attack, which it won’t use.

Worked out from base stats. Your team may need something else.

Defeating Omastar gives 2 Defense EVs.

Your game

The strongest attacking move it can learn in each type, across all games. Not every game has every move. Same-type moves get a 1.5× bonus.

Type	Move	Kind	Power
Normal	Hyper Beam	Special	150
Rock	Meteor Beamsame type	Special	120
Water	Hydro Pumpsame type	Special	110
Ice	Blizzard	Special	110
Ground	Earth Power	Special	90
Dark	Crunch	Physical	80
Fighting	Submission	Physical	80
Bug	Pin Missile	Physical	25

Regular Pokémon whose same-type moves hit it hard and who take little from its same-type moves. Picked from types and base stats only, not movesets.