Actually, to some people a Pokémon minted from a neutral nature (Hardy, Quirky, etc.) with perfect stats is considered better than a mon with the correct nature (since it can't be confused by pinch berries).I know there's a general preference for "untouched" 'mons, but I assume that a minted nature w/ perfect stats is preferred over an unminted nature w/ hyper trained stats?
Personally I think I'd rather have to use bottle caps than mints, but I think it probably varies from person to person.