Caseydia
Ace Trainer
I don't think that Butterfree is a 'fail' Pokémon at all. He clearly didn't have that great a movepool in the early days, his best moveset would have been: - Tackle, Confusion, Gust and Psybeam. Now he's got the likes of Bug Buzz, Silver Wind and Aerial Ace to improve his usage and type-coverage...
It hasn't really had alot of time to really do anything super important before it left. I doubt they will have it do something significant now after all this time.