For anyone keeping up with Sakurai's smash updates, he's released this picture today, along with the statement that all of the pokémon in https://www.youtube.com/watch?v=BgmC56ndgeg will be appearing in some form or fashion. I think I've got a full list, but tell me if I miss anything.

Dedenne, Bellosom, Snivy, Oshawott, Chespin, Goldeen, Staryu, Eevee, Swirlix, Metagross, Darkrai, Electrode, Palkia, Entei, Gardevoir, Kyogre, Latias, Gogoat, Giratina, Zoroark, Snorlax, Lugia, Kyurem, Suicune, Deoxys, Meloetta!, Keldeo, Victini, Spewpa, Fennekin, Inkay, Pikachu, Charizard, Meowth, Togepi, Greninja, Lucario