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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you have to go to the underground where the dude takes pictures of you in a Team Rocket uniform. There will be a Team Rocket grunt who is looking for recruits. He will give you a uniform.
go to the little building near bills house and there will be a team rocket grunt in there and he will give you a uniform
you have to go back to where the photographer in the underground tunnel is and a team rocket grunt shall give it for you to wear
You get it when they take over the radio tower in goldenrod city one of team rocket members gives it to you
In Heart Gold and Soul Silver, you go to the underground in Goldenrod City and meet some random guy from Team Rocket who gives you a Team Rocket uniform, believing that you are a new person in Team Rocket. However, once you get it, you can't use your bike or leave the city, and can't use the suit after your mission.