After you get the part go to the Power Plant and give it to the guy near the machine
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in a pile of inner tubes
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.
It's called the dowsing machine in SoulSilver and HeartGold, you get it from either Ethan/Lyra, or someone you have to do a job for. I can't remember which, I know you have to beat the goldenrod Gym first.