In Pokemon Dawn and Dusk, You can assign a gimmick to a pokemon before battle. Example: Assign Dynamax to Cinderace and Mega Z to Lucario. Then there is a new form, Yurei Shift. You receive the headband early in the game and once the sun or moon is pressed on it, boom! You now have Yurei Shifted (name)! Yurei shift is when the pokemon gets a ghostly form. ENJOY!!!
The gimmicks in my game: Dynamax, Mega, Yurei Shift