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The Raimon Gym is an amusement park full of roller-coasters. Several switches around the Gym redirect the path of these roller coasters. Most of the switches are guarded by Trainers. Some Trainers are already inside some of the roller-coaster cars, and will battle the player upon attempting to enter the vehicle.
Interestingly, Raimon Gym is the the first gym where Gym Leader's reward is the lowest compared to the other Trainers. This is probably due to the fact that the Trainers are Rich Boys and Ladies, who give the player extra rewards.