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>Cliff, the Fossil Fanatic
Ideally the final gym. The gym is a combination resort a la Jurassic Park where fossil pokemon are displayed in exhibits. Its city is on a small island, like Mossdeep City in Hoenn.
In the gym, trainers must scale the large skeletons of Tyrantrum, Aurorous, Kabutops, and other fossil pokemon to advance up several levels, battling trainers between them. Certain switches must be found to cause the large skeletons to change position (i.e. lower their arms) to allow the player to advance.
Beating Cliff awards the player with the TM for Stone Edge as well as access to his fossil revival services.