For me it's Zoroark. The reason is because I mean, he's kinda perfect for this kind of game and he's like the Lucario of the 5th gen (Just not as popular, obviously) 

I would also love to see some of the other 5th gen Pokemon in, like Krookodile, Excadrill and Haxorus. 

Which ones do you want in and why?

I don't know, are Hitmonchan and Hitmonlee confirmed? They should be in there so we can have Jackie Chan and Bruce Lee fight each other as Pokemon!

I want a ton more but if I have to pick the ones I want the most then:

1._ Blastoise

2._ Gallade

3._ Garchomp

Hawlucha must be on it, one way or another. Also the Hitmon- family.

Sadly not yet but I do think they should add more Gen 1/2 Pokemon for the sake of nostalgia. I mean, the more of those Pokemon, the wider the appeal. Those two would be a perfect fit. 

Ninetails would also be cool.

Garchomp and Gallade please. 

I kinda hope they add all of the starter Pokemon at some point.

Haxorus, Mewtwo,garchomp, some eveelution

Same. Blaziken is my favorite Pokemon right beside Zoroark. 

Maybe another legendary like Entei or one of the Legendary Birds. Also, an eeveelution.

Blastoise and Espeon would be my personal picks.

I'd also love to see Mewtwo as well, not just Shadow Mewtwo