Normal, fire, flying and poison type moves aren't really effective against rock type Pokémon.
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Bug and Rock Types are resistant to Flying, Fire, and Bug types.
If held by a Pokemon it will increase the power of rock type moves such as rock slide or rock throw. Giving it to a rock type Pokemon is highly suggested.
rock
The most effective in rock type Pokemon is water Pokemon ofcourse.
rock Pokemon can beat lightning and lightning attacks do not effect rock Pokemon