Besides what Pokemon are playable I'm also curious to see how Pokemon elemnts are transferred into Pokken. We know Mega Evolution is in but how is it balanced for those that don't have one. I don't think type effectiveness will be in it. Abilities could be.
Mega Evolutions could work like Supers. In games like MVC, some characters get transformations as supers, like Dante, Virgil or Arthur. As for Abilities, Blaze, Swarm, Torrent, and Overgrow would work similar to Tekken 6's Rage system. I think Status stuff like Poison, Burn, Paralyze, Sleep and Freezing could be implemented easily. I mean, Ice type fighters could just have moves that work like Sub-Zero's. Maybe some special moves will make your opponent slower.
If the type system was in, the counter picks would be real.