No, Pokken is not in EVO 2015.
EVO 2015 Line Up
Ultra Street Fighter 4
Ultimate Marvel vs. Capcom 3
Super Smash Bros. Wii U
Guilty Gear Xrd SIGN
Killer Instinct
Mortal Kombat X
Persona 4 Arena Ultimax
Super Smash Bros. Melee
Tekken 7 (arcade)
Pokken Tournament
There was a livestream that released some info on the Pokemon fighting game coming out. Suicune, Pikachu, and Gardevoir have all been confirmed as playable characters and you'll even have other Pokemon assist you in battle like the Naruto Ninja Storm games. Have some pictures.
I'm done! No funny ending! Good day sir!