pokemon wi-fi events.
but you are too late for that.
You have to buy Pokemon Platinum. (Its a separate game!)
You can only get one
in the snowy mountains but you have to eveolve it
you can find arceus in the hoenn region.
You can't catch arceus in pokemon white.
Arceus is not possible to find in Pokemon Ruby. It was released in 2007 with Pokemon Diamond and Pearl
itz a myster gift special distibution
The new pokemon, Arceus. Go to pokemon.com to find out more about arceus.
Where ever you find normal Arceus. :p
By Pokemon rangers or cheating
none
yanma