They are at the game corner if u get in the game corner u will see rocket grunt looking at the poster u hav to talk to him he will battle u then u press A at the poster it will says "there are a switch behind it" then switch it u will see a ledder u hav to get in and BINGO !!
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You can't find team rocket anymore after the one grunt in Cerulean city.
Cerulean City Gym
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.
Go to the Underground Tunnel in Goldenrod City. There is a Team Rocket Grunt there who will give you a uniform.
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