You can't find him, unless you have a action-replay, or you can trade with a friend.
Arceas has to be caught in Pokemon diamond, pearl, or platinum, then traded to Soul-Silver and HeartGold.
You have to trade it from Diamond, Platinum or Pearl
The answer isn't Lugia.Answerno its not lugia because you can get it without cheating on soul silver so i think Arceas or MEW is the rarest
if you would ask me arceas would be stronger than all fo them
first it is arceUS second yes you can trade legenderys onto Pokemon soul silver but only from pearl,diamon and platinum
in Pokemon soul silver you will find it (it is not in the grass)
You find Moltres in Mt. Silver.
You can not. There is no possible way of getting a Deoxy's in Pokemon Soul Silver.
You can find sunkern in national park
Mt.Cornet
Pokemon
You can find it on Cinnabar Island.