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Guess I can repost my idea from an old thread. It's the only gym leader I've ever wanted.
Fire type gym, with lots of Dark throughout, themed like a raging rap concert. All trainers use exclusively dog Pokémon (mostly Growlithe, Houndour, and Pooch/Mightyena) the leader has Houndoom, Arcanine and Growlithe. You gotta crowd surf your way to the stage to fight him while the speakers shoot flames.
Idk. This has always sounded fucking awesome to me.