Bringing up a point that Melee Mewtwo made earlier, I think that Genesect should certainly stay in A+ rank. Sure, it literally only has one set. But when you are making an Uber team nowadays, I feel that almost everyone pretty much just auto-adds Genesect, and then only takes it off if they have a very good reason for it. It's so powerful, fast, and checks so many threats that it's tough to build a team without it. Between U-turn, Iron Head flinches, and the always present threat of Explosion, Genesect is one of the best mons in the game right now.