Maybe a system with held itens, just like GBA/NDS games.
Ex: Exp. Share (a pokemon equipped with it, will divide experience with another pokemon in use)
Lucky Egg (Boost Chansey moves in console games, maybe here should improve luck in loot drops)
Light Ball (Boost Pikachu moves in console games, here, maybe should improves electric damage in 5% and give "Light" Ability)
Quick Claw (Your pokemon gain a first strike chance in console games, here , should decrease in 5% cooldown moves).
Of course, its just a suggestion, but it'll be fun to see Held itens here...