I don't think you can... I've beat the game like twice. Try Diamond version hun. :3
there is no explorer kit in soulsilver.
You can't mine underground in either Pokemon Heartgold or Soulsilver, but you can mine underground in Pokemon Diamond, Pearl, Platinum.
You cannot get an Explorer Kit in Pokemon Soul Silver.
The explorer kit isn't available in Pokemon heartgold and soulsilver
You cannot go underground as you were able to in Pokemon Diamond and Pearl. You are stuck above ground in Pokemon SoulSilver. You get two regions to go between, though.
The card key in Pokemon Heartgold and Soulsilver is located in the Goldenrod Underground.
No. The underground is only in Pearl, Diamond and Platinum.
you need the underground kit to go underground MORE HELP: you get the underground kit in eterna city the houses next to the bike shop
You can get the Underground Kit from the Underground Man in Eterna City. This kit allows you access to the Underground! Hope I've helped! .:Funkeheap15>.<:.
I don't think that there is one
Underground in Goldenrod City.
you can't get underground in soul silver. if you're looking for stones trade Pokemon from diamond, pearl, or platinum holding them.