you cant delete your Pokemon from your party directly but you can deposit them into the PC at the Pokemon center or you can release them if you wish to get rid of them
the option is in your PC i do believe.
Chat with our AI personalities
You switch the pokemon you have in your party or you could ride your bike. I would just ride my bike if it was me.
no you can trade soulsilver pokemon to black
on the main menu press new game it gives a warning that you can't save and it gives you a code to delete you game 8-)
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.