I'll start. I'd for there to be some sort of deleveling option in Pokemon games. Where you can just delevel your mons from 100 all the way down to 1. I just find it kind of boring that most of the Pokemon you catch will spend all their time sitting in a pc box. Shinies are basically just trophies, would be cool if you could delevel them down to like 10 and use them again in a new playthrough. Devolution too while we're at it, so if you regret evolving Eevee into a Flareon, you can just devolve it back into Eevee and then evolve it into something else.