Quote:
Originally Posted by EldrickOnIce
Fight with ground or steel Pokémon. They do 2x damage to rock type Pokémon and received half damage in return. Would be easy enough gum to conquer (with 6 on 1!)

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Fighting types also smoke rock types. Water and grass are effective as well, but do t have the resistance. Rock type has so many weaknesses it's tough to bother with.