Hello, my name is BananaPixel, and I'm here to give an idea that, personally I think that most people should be able to get it, and it's the Exp. Share. A lot of people have hundreds, and hundreds of Pokémon, but their Lv is low due to the time it takes to level them up. An Exp Share would be useful for making Pokémons that aren't in the battle, get some Exp. I'm not the only one that wants, but quite a lot of people!