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.
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he's on the gold bridge. if not then check the gym
you go to the cerulean gym by the floaties on the left after take it back to power plant
in the gym in cearulean city
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!
top left tube