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Why are some Pokemon weak to their own types? I don't get it, shouldn't they at least be neutral to them? I'm specifically referring to certain type combinations, not the situations that Ghost and Dragon types have.
Take Nidoking for instance, who's Poison/Ground, why is it possible for him to take super-effective damage from Earthquake, a move which he himself can dish out at relatively high power?
Consider this from an out-of-battle point of view too, will Nidoking take damage if he goes underground to do fuck whatever? Digging? I don't know.