In Pokemon Heart Gold and Soul Silver, after you defeat the rocket grunt, return the piece back to the Power Plant. Then, you will receive a TM, and then you can finally battle Misty at the Cerulean Gym.
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You can't find team rocket anymore after the one grunt in Cerulean city.
you dont
if you mean on the bridge in cerulean city ,after you have defeated the man their you have yo check the rubber rings at the end of the cerulean gym
In cerulean, go to the power plant talk to the manager then go to the cerulean gym and then you'll see team rocket.
Cerulean City Gym