>>46534486things i'd want would be higher difficulty, being able to turn off the exp share, including the missing pokemon, a graphical improvement for places like the wild area.
ideally there'd be some more changes like fleshing out some of the routes to be a little less linear, giving bede and marnie more to do and having some more battle facilities in the post game, since the battle tower and restricted sparring don't cut it on their own (maybe make the galar star tournament one with set levels as a start)