New, more powerful variation for Pokemons: (You)-Form.

These Pokemons adapt their appearance to look like the trainer (think of Ash-Greninja)
(You) are stronger than Megas in every stat, except Defense, which falls by 2 stage.
(You)'s moves are all Z-moves.

The problem with them is that they may become too self-centered to listen to their trainers and may ignore them.