Groudon
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This is because you have to go in the cave at the top of the town then the gym will open.
Sootopolis. You have to go through the whol Kyogre episode then the gym will open up. (Sootopolis is the white place you have to dive to get into.)
you have to learn dive first beat the twins then get dive go on you way to sootopolis and when you see dark spots in the water use divethat's how you get into sootopolis
easy
In the sootopolis city gym.