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>Cave-Themed Gym
Trainer walks into pitch black gym with only a small circle of light around them.
Invisible walls, much like Koga's gym
Every time challenger beats a gym trainer the circle of light gets bigger until cave is completely lit and it's time to battle Gym Leader
All gym trainers use Pokemon equivalents to real world animals and objects found in caves.
Winner gets the Erosion Badge and TM80
>Team
Crobat, because bats.
Golem, because rocks
Omastar, because fossils, also pic related