Leon
Chances - 0.1%
Whhyy??
Want - 0%
Wolf is all we need.
Trainer-less Pokemon
Chance - 5%
The only way I could see this happening is if Charizard became a solo character, but if that were the case then suddenly one of the most interesting characters would just devolve into the generic concept of flying, fire-breathing dragon thingy.
Want - 0%
I don't care about tournament viability or Project M, Pokemon Trainer is my second main and I want him to stay. And maining Pokemon Trainer means knowing which pokemon to start with, when to switch, how to use each pokemon, etc etc.
Take that away, and you lose not only one of the most unique characters but you also take away the one pokemon character that represents pokemon best. The whole idea of pokemon battles in the game is that you have the team of pokemon and you're able to switch back and forth to adjust your strategy and win AS A TEAM. Watch competitive pokemon battling, and you'll see it feels like there's sometimes more switching than actual attacking. Pokemon Trainer represents that fantastically, and it makes no sense to me that such uniqueness would be ditched.
As for stamina, I think it's a great idea in that it was meant to force people into actually playing in the spirit of the Trainer and SWITCH, instead of being another Sheik where everyone picks Squirtle and the other two get completely ignored. However though, I would say it was poorly executed in that instead of rewarding switching in and out, it punishes not doing so.
I'd be cool with the system being revised so that you can stick to your Pokemon without it getting tired, but if you switch you have maybe less damage or less knockback ... maybe have each pokemon maintain their damage counter, but maybe in a not-so-broken-sounding-way.
Also, to respond to what someone suggested above. Blaze/Torrent/Overgrow is not about the Pokemon absorbing moves of the same type, but about their type attacks getting stronger when their health is low. Given how this is Lucario's gimmick, for some reason, I doubt they'd incorporate their abilities in the game.
Also, I hope that type chart mechanics stay out of the game, it'd be annoying having Ivysaur be useless against the multitude of fire/explosion-type moves from Snake, Samus, Mario, Luigi, Link, Toon Link, Game and Watch, R.O.B., Bowser, Zelda, Captain Falcon, Ness, Lucas, Ike, Diddy Kong, Olimar, Fox, Falco, Charizard and now Mega Man.
Prediction
Reyn - 1.2%
Shulk's the one I see making it in. Don't see the demand as high for anyone else. And of course I'm assuming Reyn is from Xenoblade, because all things considered, I really have no clue.
Nominations
x5 Super Mario 3D World Stage