Instructions
The First Room
Climb onto the platform and interact with the green button.
Climb down from the platform.
Climb onto the second platform and press the second green button. This will open the path to the first trainer battle. Once you defeat him, proceed through the door
The Second Room
Hop onto the only open platform and activate the blue button three times.
Walk onto the platform to your left and walk around until you find the second trainer.
Proceed past the defeated trainer to press the second blue button once. The platform with the green button will now be clearly visible and accessible.
Climb onto the platform with the green button and press it.
Hop off the platform on the right side.
Cross the gear platform and exit through the door.
The Third Room
Climb onto the platform with the red button and press it once.
Hop down, walk over to the platform to the left and press the second red button. This will give you access to the third trainer.
Defeat the third trainer.
Proceed past the defeated trainer onto the platform with the green button, which you will need to press three times.
Walk across the path that opened up after the third press of the green button until you find a blue button. Press the blue button.
Walk north to the next ledge, then take the first right and down. This will bring you to the final trainer before the gym leader, who you will also need to defeat.
Proceed past the defeated trainer, going across the gear bridge.
Go to the bottom of the gear bridge, then to the right. Press the red button.
Backtrack to the gear bridge, The path to the final gym lead will be clearly visible.