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
When you beat snorlax
You can't. It's impossible.
He is in the underground path, that goes under Goldenrod City
There was a lot of suspicious activity in the underground path. If you've played the original Red or Blue versions, many burglars and suspicious characters hung out underground. The police put an end to that in SoulSilver.
You dont. There is no underground.
The underground path? You can only get in on Red, Blue, Yellow, Firered and leafgreen. On the jhoto games, it's locked.
How i rebuild the soul and open the path
unfortunately, no. unless you're referring to the underground paths.
ice path
In the Ice Path
in the ice path
The Goldenrod Underground.