Yoshi is from Mario games. There is no such thing unless hacked.
You can't. Yoshi is not a pokemon.
no you can trade soulsilver pokemon to black
Pokemon eggs hatch pokemon. Yoshi eggs hatch Yoshi's.
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 CANNOT LEGALLY download Pokemon Soulsilver.
You can't catch bastiodon in Pokemon soulsilver.
Pokemon belongs to gamefreak, but Yoshi does not. He is part of the Super Mario franchise and Nintendo.
You'll need to trade for it from Pokemon HeartGold. It is not avilable in the wild in Pokemon SoulSilver.
there is a mew in Pokemon soulsilver but you need to catch all leadndery Pokemon including event Pokemon