My prediction is they'll do something like Ash Greninja. A handful of Pokemon (Charizard, Lucario, Pikachu, Gengar, etc.) will get a battle bond form. This form will have a few parts of their design that will change based on how you customized your character. It will get little bits of hair that will match your hair color, or it will have a part of it's torso recolored to match the shirt you are wearing. What is your gimmick idea for Gen 9?