Genesect. I feel like he's a Mewtwo (manmade) and Arceus (drives) knock-off and was wasted by being an event only character. I don't like how people are saying he should be in SSB4; he's old news now that Gen VI is coming out.
Kinda agree with this to be honest. Especially Gen V legends - I basically only like Terrakion, Reshiram, Zekrom and the white/black Kyurem formes. That means I don't like Cobalion, Virizion, Tornadus, Thundurus, Landorus, Kyurem (basic), Keldeo, Meloetta (aria), Meloetta (pirouette) or Genesect.
I'll probably get leathered for this but I've never really understood the big deal about Mewtwo either. I prefer his new forme.