Asked in Pokemon HeartGold and SoulSilver
How do you get in the underground path in Pokemon HeartGold?
there is not an under ground like in diamond Pearl and platium
But there is an underground path going from celrilum to verrilum.
P.S. The one from celedon to lavender town is Shut of now even though it wasn't in leaf-green and fire-red ( I'm not sure wheater it was open in gold, silver, and crystel)