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Ride/fallowing pokemon
Pokemon encounters appear in the overworld and will chase/flees from you depending on the Pokemon's nature, like brave or timid, abilities like intimidate will cause foes to freeze for a seconded before chasing you down.
Removal of HM's
More freedom in where you can go, and giving the player more options on what gyms to take on, wild Pokemon levels will scale depending on how many badges you have, same goes for gyms.
Throwing Pokeballs at high leveled Pokemon that have not been weakened have a chance to destroy the Pokeball before it hits them.
Gym leader all have one totem Pokemon as their ace, stat buffs and everything, and you can encounter totems in harder to reach/post game areas.
Gym leader rematches.
Trainer customization that's actually good, and give the outfits the gm leaders wear as an option
All online features from the previous games are back, and it should work like xy/oras's not whatever the hell sun and moon had.
secret bases
Difficulty settings
Starters that don't look like hot garbage for once.
a real rival.
Make the tutorial optional for once.
This will never happen, but just let me dream.