Oh we talkin best gens? Gen 5 baby can't beat it! So many of my fav pokemon are from that gen, Cofagrigus, Seismitoad, Leavanny, Druddigon, Scolipede, all classics man. Plus the bad guys actually had a plan that kind of made sense. I haven't looked into the pros and cons of that Gothitelle leak but as I've said before, I'm all about that.
Honestly I think one of the things that keeps Zoroark as a pokeball (among a number of other things, don't worry I know) is that it'd be hard to find a way to implement the illusion ability. properly. Like how would that even work in smash brothers? Anyways, it'd be cool to see gen 5 in smash playable but I wouldn't put money on it.