There's only one spot left at the Pokémon selection screen. Who knows what fighter would Pokken pick for that spot alone? Make your speculations.

Kangashkan
Battle Style: Power
Description: Works like Roger Jr. in that the mother is what the player controls.

Typhlosion
Battle Style: Speed
Description: Runs on all fours and uses moves like Flame Wheel and Eruption which is similar to Blastoise's Water Spout move.

Sudowoodo
Battle Style: Technical
Description: Use Mimic to copy the opponent's last move and uses it to it's advantage.

Dewott
Battle Style: Standard
Description: Most of it's moves are sword-based such as Night Slash, Fury Cutter and Razor Shell.