Hitmonlee and Hitmonchan
As the “original” fighting Pokemon, Hitmonlee and Hitmonchan seem to be destined to be part of the roster. If not both of them, then definitely at least one of them. There’s also a good chance that Hitmontop and Tyrogue might make the roster as well, all of the Hitmon Pokemon are very diverse in their fighting styles and could conceivably all sit on a spot in the roster without really having clashing move-sets. Really, these two aren’t so much possibilities as certainties for Pokken Tournament.
Odds of Inclusion: I Will Eat My Hat If They Are Not Included