You have to trade with the Diamond and Pearl Versions.
No
Arceus is not obtainable in the Heart Gold and Soul Silver games.
Arceus celebi
You can't get Arceus in Soul Silver.
No, the movie Arceus that has been distributed in Japan is not the only Arceus that will work for the Heart Gold and Soul Silver Arceus event. That Arceus was special, because of the fact it unlocked a special Pichu event in Heart Gold and Soul Silver. Any Arceus will work for the event in which you can get a Level 1 Dialga, Palkia, or Giratina in Pokemon Heart Gold and Soul Silver.
get an arceus of platinum and trade to soulsilver then go to the ruins.
yes you can if you have lugia
any time
No, only from Nintendo events.
No
Arceus? By Event only.
On the S.S.A Aqua.