unfortunately, no. unless you're referring to the underground paths.
go to underground goldenrod
In both heart gold and soul silver, you are unable to go to the underground, you can however go there in Pokemon diamond, pearl, and platinum.
You dont. There is no underground.
The Goldenrod Underground.
go to the underground part of ruins of alph. you'll run into them if you run around.
yes
there is a grunt in the underground,you just need to look for him/her(i dont know what gender).
When you beat snorlax
i don,t no but if your talking bout how to go underground in Pokemon platinum you have to go to eterna city and enter the house next door to the Pokemon center. hope i helped! :D
Go underground route 4-5 in kanto and talk to a guy that's there. he will give you the TM explosion in return for it.
its at the basement of the dept. store in golden rod city
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.