How do you do the Arceus event in soul silver?
You must have a LEGAL arceus from the arceus event on Pokemon pearl, diamond, or platinum.
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.
There is only one way to get Giratina... and that is to have the event Arceus. I heard that if you were lucky enough to get the event Arceus you go on some special mission with it in Soul Silver. In the mission with Arceus on some part you get to choose one of the three legendary Pokemon: Dialga, Palkia, and Giratina. That's the only way to get Giratina in Soul Silver. Either that or…