[@MissFortune] Zorua's ability illusion only affects perception, so even if it turned into like, a Charizard, only the actual position of Zorua will be hit, so attacks could fly through it. That said, it won't gain any abilities using it's illusions like electric charge. You could just easily have it straight up steal though, Zoruas are small and fast, so they can be quite stealthy too.

[@EWillden] Larvitar is actually Rock Ground, only when it is Tyrannitar does it gain the Dark typing, but losing the Ground typing, making Tyrannitar Rock Dark.