It is in the Cerulean Gym in the air thing on the left side. Hope i helped!¡
At the Power Plant.
It's in mistys gym
you go to the cerulean gym by the floaties on the left after take it back to power plant
You get that part in the gym leaders building in the rubber tube.This is in Cerulean City
Power Plant
he gives you the missing machine part for the generator at the power plant :) hope i helped :D
you have to have completed the power plant mission and he will be outside the power plant on the left
The grass in Kanto by the Power Plant.
See below
it is i the kanto region in soul silver after you defeat the elite 4
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.
I don't know when but after a while the power plant