I really hope Mewtwo will return this time (like normal form more, but it's new form/or at least with transforming to both is more likely).
Other than that it's pretty difficult to say. There are so many of them, although a big part is flying/swimming/can't jump/something else so they couldn't really make it in...
What I'd like the most would be:
- Rampardos (3rd favorite Pokemon after Kyogre and Omstar, which both wouldn't really fit there, although I guess you could somehow make Omastar work in Smash, but it would seem really really strange)
- Scizor (I was so hyped when I saw him in a trailer in Melee, but I later found out he wasn't playable...
)
Those would probably be my top choices. After that maybe Blastoise or Hitmonlee.
But tbh I'm sure the chances of any of those except Mewtwo are almost zero, so I don't expect them to be in the game (at least not playable).
As long as Mewtwo's in I'm happy...
What I think is:
Pikachu (already confirmed and obvious)
Mewtwo (has a good chance, but isn't a shoe in)
Jigglypuff (has a good chance to return because it's there since the beginning)
Charizard (might be still in the game, but probably not)
PT (he may be still in the game, maybe with different Pokemon, but I don't think it's very likely)
Zoroark (maybe)
Lucario (might return, but I think it's more likely he won't)
I'm thinking Pokemon will have 4 or 5 characters. (PT counting as one)