You cannot get into the volcano. The volcano is non-existent after the burning of Cinnibar Island. All you can do on Cinnibar Island is collect items and use the Pokemon Center.
its gone it was destroyed by the volcano
There is no mansion in SoulSilver.the Pokemon mansion on cinnebar was destroyed when a volcano wreaked its havoc on the island.
You can catch him from the following places:Victory Road Floors 1, 2 and 3Safari ZonePokewalker on the Volcano Path
no you can trade soulsilver pokemon to black
he is not in Pokemon soulsilver or Pokemon heartgold
POKEMON SOULSILVER come with a poke walker and the Soulsilver game
Pokemon soulsilver and Pokemon heartgold are basically the same game just different versions but i do recommend buying Pokemon soulsilver
SOulsilver
You can't catch bastiodon in Pokemon soulsilver.
You CANNOT LEGALLY download Pokemon Soulsilver.
You'll need to trade for it from Pokemon HeartGold. It is not avilable in the wild in Pokemon SoulSilver.
You cannot battle between a Pokemon Black game and a Pokemon Soulsilver game.