In fire red you have to first beat 7 gyms. In the eighth gym you will VRS team rocked boss. I recommend using a water type level 50 or higher. After you have beat the eighth gym, head off to the Pokemon league! I believe their highest leveled Pokemon is in level 60 something. Than you need to capture 60 Pokemon. Now, after you have captured 60 Pokemon, you have two choices. You can either go and get the ticket that allows you to go to all of the islands or you can go and capture mewtwo in the town where Misty's gym is. There is a cave that you have to surf to and it is located left of the golden bridge. Once you are at the entrance of the cave, talk to the guy blocking the entrance and he should let you pass. Go through the cave and you will catch mewtwo! Mewtwo is at level 70, so be prepared. At the 8 islands, I am not too fimilar where team rocket's base is on the 8 islands. Hopefully someone else will answer the question in more detail. Good luck! :)
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In cerulean, go to the power plant talk to the manager then go to the cerulean gym and then you'll see team rocket.
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
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.