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7th gym, ground type. The gym is composed of floating islands of earth, when a trainer is defeated on one of the islands two paths of floating rocks appear to another island. One of the paths will lead you closer to the gym leader, the other will either collapse and send you to the beginning of the gym or lead you to a trainer. When that trainer is defeated no paths will appear and you will have to go back the way you came.
Gastrodon
Camerupt
Hippowdown
Mega-Garchomp
Tm26 Earthquake