It is behind the tube next to the gym leaders chair
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after beating the gym leader misty, go down the stairs of the gym, go left and press A on the rubber rings, this is where the machine part is for the power plant.
The powerplant one? Well. go to Mystys gym top mid-left of the Gym you will find Machine part, bring it back to the plant and your good!
you go to misty's gym and look in the swim rings after you beat the team rocket grunt in cerulian city and talked to the guy in the kanto power plant.
he's on the gold bridge. if not then check the gym
Gary isnt a gym leader