add reborn-specific move tutors, to teach low and mid level typed moves to pokes who need them (and make the cost low or easily obtainable),
make sure that there are good places to level and get cash in the game (not just pickup),
make all the items for evolutions readily available if not buy-able,
add in-game volume/time controls,
and change the weather system to be easier to work with (rather than having to cheese the system).
I want to be clear though: This game, as it stands, is incredible.