Eldon
Bug Catcher
There should be an item that boosts your exp, unlockable after say you get all the gym badges. Possibly an add effect to the dragon gym badge, that increases exp gained from battle x2 or something. Personally i enjoy hunting and capturing pokemon but certain ones have to be evolved by leveling, and that can take a very long time to do over and over. Allowing trainers to get a bonus at the end of the game encourages replay between expansions.