It is next to the Name Rater's house, and the sign says " Watch out! get off your bike in the tunnel"
the underground tunnel in goldenrod
Goldenrod's Tunnel
you have to dress up as a team rocket member at that one tunnel in goldenrod city but he might not give it to you
get a team rocket uniform in the tunnel of goldenrod city do all this stuff in the radio station then go to the tunnel and back again (you have to do all this stuff in the two buildings).
You go to the goldenrod tunnel and look for a teamrocket guy and you walk in front of him and he gives you the shirt.
theres not but there is team rocket
you batle them
u go in the tunnel goldenrod city sombody givs it 2 u and im not lying
get a rare pokemon thats what i did
Goldenrod.
Where the Pokemon Salon is, a newcoming Team Rocket Grunt will give you the Team Rocket uniform.
The Goldenrod City tunnel in Pokemon HeartGold is in the place where you got your Team Rocket uniform from.go in all of the houses in goldenrod and then you will find it (it looks like a very small house