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Gym is in the middle of a revered graveyard, and the Gym Leader is in charge of making sure the place doesn't get grave robbed.
You encounter the Gym Leader and his Duskull while thwarting the evil team as they're about to steal a relic.
The gym itself is an old, abandoned house on the north end of the graveyard, and the puzzles revolve around going to each room to flip a switch that changes something in another room.
TM is Shadow Claw
Badge is the Tomb Badge.