You have to catch a Bellsprout or a Weepinbell (Evolves from Bellsprout). Then you can use a Leaf Stone on the Weepinbell and it will become a Victreebel.
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Victreebel
He captured it since it was a Bellsprout and when he taught it several attacks, it evolved into a Weepinbell. Later, James taught it how to do vine attacks against other Pokemon and it evolved into a Victreebel.
no you can trade soulsilver pokemon to black
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.