got the equivalent dust (400 000)? ;).
I'd transfer with pinsir and scizor, both good against mew, mewtwo, celebi. Tyranitar if you only have 1-2 might be a good future dust project.
But rare candies is imo over-saved. easy come and easy go. It's no big deal if you waste 100-200 rare candies. Easy to get more.