>>55671268Mostly just the standard updates like full 1025 natdex + box space to accompany them, new moves, items, fairy type, physical/special split (XD did it a little with the new shadow moves) online battle mode, etc and backporting some of XD's improvements to Colosseum. Otherwise all I'd really want is all the bonus/regional stuff unlocked like celebi and the e-reader trainers/shadow pokemon, more shadow moves/pokemon for even more variety, and expand the post-game with enough stuff to justify using the pokemon you get late game, like open up some of the XD areas in Colosseum and give XD a plot about Eldes secretly reopening the Under/Deep colosseum so we can have those back and tie up the loose ends from where they clearly tried to leave it open for a 3rd game.
I disagree about the purify chamber being added to Colosseum though. It doesn't make sense if it was still under construction in early XD, and making shadow pokemon more fun to use would fix the issue of purifying a whole bunch at the end for ho-oh being such a slog. Plus if you don't care about 100% or trading those pokemon over to home or something and just want story completion like most casual players, then there's no reason to spend the time to purify the ones you don't intend to use anyways regardless of if it takes 2 hours or 2 days.
