You must complete the events starting at the cave of origin.
You find him in the last Gym in Sootoolis City.He is the last Gym leader
Help me
Pokemon league
The Sootopolis City Gym door is unlocked after you retrieve Rayquaza from the Sky Pillar.
sootopolis city
Victory road
Water.
You have to find raquaza. Then raquaza scares groudon and krogoe ( or something ) away. Then, you can get into the gym.
The sixth gym in emerald...is the gym in fortree city....and the leader is winnona...
Find the Flame Gym, and when you won, you come out from the gym, you will show Your friend, and he will pass you a special glasses. Soon, you can enter the sand area.
The second gym leader is brawley of Dewford town. You will come to the PetalburgGym second, but that's the last gym leader you'll battle.
Defeat all of the Gym leaders on Emerald. ~KKMG1