you have to find steven get a Devon scope and use it on the invisible keckleon in front of the gym
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The fifth gym is in petalburg city
In Pokekon Sapphire, you get the 5th badge after defeating your opponent in a Gym Battle at Petalburgh.
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.)
The gym in Petalburg.
In the lavaridge town gym.