Simply go inside then go downstairs.
In the north of the city, west from the gym (next to the Name Rater's Tent)
go into the underground path go down the passage way and there will be a door go into it and there will be a room with three buttons in it
You get it from Lyra in the goldenrod underground.
a tunnel
u get it for Goldenrod CIty Underground
In GoldenRod, go to the underground passage, and go to the photo area (Top Right area) A Grunt will think your new, and hand you a uniform.
The bf in the department store and in the underground hall thingy in goldenrod city
3,2,1
The Goldenrod Underground.
Underground in Goldenrod City.
in the underground tunnel in goldenrod
there is a grunt in the underground,you just need to look for him/her(i dont know what gender).