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.
rock
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.
The most effective in rock type Pokemon is water Pokemon ofcourse.
rock Pokemon can beat lightning and lightning attacks do not effect rock Pokemon