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Counter guide · Rock / Water · Gen I

What beats Omastar?

The 5 hardest counters to Omastar ranked by type effectiveness, base-stat total, and Speed. Kartana outspeeds and hits for 4× with grass-type STAB.

Omastar
No. 139
Omastar
Rock Water
BST 495 · Speed 55 · Atk 60 · SpA 115

Top 5 counters

  1. #1
    Kartana
    No. 798
    Kartana
    Grass Steel
    Hits Omastar for 4× via grass-type STAB Takes ½× back from rock-type STAB Speed: 109 > 55 (outspeeds) Lean: Physical (Atk 181)
  2. #2
    Virizion
    No. 640
    Virizion
    Grass Fighting
    Hits Omastar for 4× via grass-type STAB Takes ½× back from rock-type STAB Speed: 108 > 55 (outspeeds) Lean: Physical (Atk 90)
  3. #3
    Chesnaught
    No. 652
    Chesnaught
    Grass Fighting
    Hits Omastar for 4× via grass-type STAB Takes ½× back from rock-type STAB Speed: 64 > 55 (outspeeds) Lean: Physical (Atk 107)
  4. #4
    Breloom
    No. 286
    Breloom
    Grass Fighting
    Hits Omastar for 4× via grass-type STAB Takes ½× back from rock-type STAB Speed: 70 > 55 (outspeeds) Lean: Physical (Atk 130)
  5. #5
    Iron Leaves
    No. 1010
    Iron Leaves
    Grass Psychic
    Hits Omastar for 4× via grass-type STAB Takes 1× back from rock-type STAB Speed: 104 > 55 (outspeeds) Lean: Physical (Atk 130)

Omastar's type weaknesses

4× weak to
Grass
2× weak to
Electric Fighting Ground

How this list is computed

Each candidate is scored on best-STAB damage into Omastar, the damage taken back, Speed comparison, base-stat total, and offensive lean (Attack vs Sp. Attack). Candidates that Omastar hits super-effectively for 2× or more without taking comparable damage back are filtered out — they die first. Type-immune candidates are excluded entirely.

Counters are theoretical type-chart matchups, not damage calculations. Item, ability, and move-set choices can swing real battles. Use this list as a starting point, not a final answer.