Ethan/Lyra is your 'friend' during the main story, but you don't really get a girlfriend or boyfriend ingame. The Daycare centre couple talk about it when you first get to the Daycare centre. ....
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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.
there is a mew in Pokemon soulsilver but you need to catch all leadndery Pokemon including event Pokemon
It is impossible to move a Pokemon from SoulSilver to Sapphire as the two games are from different generations, you can only migrate Pokemon from Sapphire to SoulSilver.