So far, there is no Nintendo event to get Arceus for your DS or DSi.
in 2010
It is from an Nintendo Event.
You have to wait for a Nintendo event to come to a nearby store. You can also connect online using the DS. A Nintendo event has not yet happened for Arceus in Platinum.
there was none that i know of...
In Japan in December 2010
Official events are the only way to catch Arceus.
You have to attend a official Nintendo event. For now Arceus has been released only in Japan.
Yes, but you have to get it from a Nintendo event (If they have any new events for Arceus) or trade with someone who got it from an older event.
you need the action replay or a Nintendo event.
Nope.
Um, WHAT? Anyway, Arceus can be caught in the Hall of Origin (available by Nintendo Event).