Victory Road.
Train it to level 40.
train... train...TRAIN...
Train your pokemon.
train, train and more training. or use the pokemon clone glitch and let your pokemon hold a rare candy for level up.
At the Pokemon league.
Train your Pokemon and level them up by battling.
You must "endlessly" train your Pokemon.
the price is a legendary Pokemon dialga at level 90 and the secret is train all of your Pokemon level 70 don't increas all of your Pokemon's level when its 70 you will never win train (ALL) of your Pokemon level (70) all you catch and received pokemons. (tips to train all of your Pokemon to level 70 battle the Pokemon league
you train them
Train them............
You keep on fighting Pokemon until you level up.
Anything you want after you train it.