Yes
You get it from Professor Elms Lab.
you must trade with a freind that has a starter pokemon that you dont have.
Trading is the best way to get all of the starter Pokemon's on SoulSilver.
you cant its a starter Pokemon
You can't but you can get the starter pokemon.
manaphy; rotom
Yes
the only legendary that you can breed is manaphy. and that will result in a phione.
Yes, Beldum can breed but it can only breed with Ditto.
chikorita it gets pretty tough