you need to first go to the power plant and find out that there was a thief and then find him in Misty's gym and then interrupt misty's date on route 25
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Go to the Gym talk to Misty than go to the pokemon league and go back to Misty
first you have to go the power plant and talk to the manager then exit the powerplant and go to the gym there you have to find the missing part take it back to the powerplant then go to Cerulean Point there you will interrupt misty and her date and she will go back to the gym
go to the end of cerulen cape then talk to Misty. go back to cerulan city and she will be at the gym.
In order to get Misty and the gain back to the gym. You first have to visit the Power plant way down on north of Lavender Town and under near the Rock Tunnel. (You need to take The Rock Tunnel to get to it) You need a Pokemon that knows FLASH! Once you are at the power plant talk to the people and they will tell you that a thief stole a piece of the machine. Then go back Cerulean City, go to the gym, the thief will be waiting for you, he will run away, but will be on the bridge. You will battle him but don't worry he has weak Pokemon. After that continue go north, then battle seven trainers to get to Misty. (she will be up on a hill with her Boyfriend) You can return to the Gym and take on Misty! (Remember she uses Water Pokemon)
Go out to route 25 and misty will be there when u get to the end. When she and her boyfriend see u, misty will go back to the gym for u to battle.