>>45359109>MegasChange the Pokémon’s constitution and appearance. Their stats (besides HP), their ability, and moves, but don’t have an affect on those things by themselves.
>Z-Moves Change the Pokémon’s moves, mostly without a secondary effect however.
>Dynamax Change’s the Pokémon’s appearance but maintains nearly everything else, having a universal HP boost and affecting moves and their secondary effect. Somewhat a fusion of the past two.
Since the Pokémon themselves and their moves have been done, I’m gonna guess Ultra Abilities or something. Calyrex’s As One set the stage for some ability fuckery.