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Well I'm not sure if it's rock or ground(I'm pretty sure it's rock), but its just like rain. It does raise he attack power of it, yes. I wish there was something like that for all types though...
He's still weak with both Dark and Rock to Fighting, a type where a majority of the moves are physical and involve the regular Defense stat, and he'd take 4x damage. It's a shame it's not both stats, because I personally love Tyranitar's stats and moveset, but a Mach Punch to the face can hurt him pretty badly.