inthe cerulean gym,at some floats but first u have 2 find that team rocket dude and battle him.
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You get the piece at misty's gym in the water square int is invisible, Then you go to route above Cerulean city she'll be on a date. her boyfriend goes away. she heads back to her gym you get to battle her now, good luck.
Go to Cerulean City's gym and it is in the middle of the gym in the water.
You can catch them in Viridian Forest as well as the Power Plant
After meeting the man in the powerplant, go to cerulean gym there you wil find a rocket grunt after beating him, find the missing part in the gym, it in the water.
Surf to the power plant. Then go inside and talk to one of the people. He will tell you to get back the missing parts. Go into Cerulean Gym. A Team Rocket person will run into you. Battle him and then go to the top tube on the left side of the gym to get the missing parts. Return to the power plant and give the missing parts back to the person.