go down to the little makeup place then a man will give you a team rocket uniform, then you talk to the woman guarding the stairs and she will be about to let you through and your rival will come scare her away and rip the clothing off of you
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You get it when they take over the radio tower in goldenrod city one of team rocket members gives it to you
After you do the team rocket thing the guy gives it to you at the top of the radio tower.
You need to get a Team Rocket-outfit which can be obtained in the underground road in Goldenrod just south of the Radio Tower. After obtaining this you can access the other levels of the Radio Tower. After that it is pretty straightforward.
Get the clear bell as a gift from the Radio Tower Director (from Goldenrod) after defeating Team Rocket. Go to the Tin Tower entrance and you will later face three sages that you must battle. You meet Suicune once you enter the tower.
At the radio tower after you save it from team rocket.