If you want to level up fast you first have to have all of the badges.Then fly to the elite four heal up your Pokemon and stock up on hyper potions and revives.You go to fight the elite four don't forget to save your game after each battle.I have beat the elite four about 25 times with my level 69 infernape and level 66 dialga also a level 78 drifblim.So I have caculated the amount of exp points you get and how much money Money 67,380 Exp 52,760