also please change the z-move that turn necrozma into ultra necrozma because its just still a mega icon, please change it into z-move icon please. Same with that is dynamax icon for dynamax and gigantamax move in external move also.
I think you should make like when dynamax the sky turn red like in game and anime.
This is the most important thing for this feature that only ETERNATUS can eternamax and it will done it by learning eterabeam as a requirement of course, also sky turn red and it will came back to eternatus when back to ball.