The fighting type is weak against flying and psychic. Those types of attacks do 2 times the damage. That is if the Pokemon is only one type. If it is more than one, things change a little.
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Bug type Pokemon are weak against Fire, Fighting, and Flying. Not fighting there not weak against fighting types, there weak against Fire, Flying and Rock.
The fighting type is weak against Ghost and Dark Pokemon, so a Sableye would be good.
Fighting and bug.
Normal Pokemon are weak against fighting Pokemon.
Fighting-type pokemon are weak against it.