first you must of completed all of the gyms. fly to sunyshore city then go to the girl on the beach talk to her and she will give you the move waterfall. Next surf across the water and keep on going straight ahead till you reach the waterfall. use waterfall up to the island then you must complete the cave once you have completed the cave go in the water and surf again straight ahead till you reach the waterfall go up it the you will be at he Pokemon league. then when you have finished the Pokemon league go to how to go to the fight area for how to get to the fight area.
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Go to the Pokemon league.
back to the Pokemon league
go to the bottom of the waterfall at the Pokemon league.
go to the Pokemon league north of sunyshore
Go to the pokemon league and go in the enterance