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New Pokémon only obtainable by breeding.
>Breed a Psyduck and a Bibarel and it makes a Platypus Pokémon.
Tiered online battles
>Don't care if it's Smogon or some other shit, I just don't want to have to battle OU: The Team and 6 legendaries 80% of the time.
More diverse rival battles
>Your rival goes wandering around the region to complete his Pokédex after the Elite 4. You can encounter him at any time and his team is always different although battles are optional since he appears randomly
Rematches go to level 100.
>Elite 4 rematches and Gym leader rematches as well as some trainer battles can eventually reach level 100 to make the constantly relevant.
Challenge keys make a return
>Hard challenge key features EV trained Pokémon with proper moves and good AI.
HM moves can be deleted
>Self explanatory. I have no idea why this still isn't a thing.