You know, on the subject of Pokemon, what about another trainer? Except one of the more prominent ones, like Giovanni, N or Cynthia? I mean, some of the trainers themselves are popular in their own right.
Sure, if they do the swap mechanic again, it wouldn't exactly be anything new, but it doesn't mean that they can't have their own unique twist. Like maybe 2 Pokemon to switch between with a gimmick based around Double Battles from Pokemon, like Specials utilising both Pokemon or a Partner mechanic similar to Marvel vs Capcom where the other Pokemon can be called out to do an attack to help the Pokemon in play?