Currently you cannot capture Arceus in the wild or by events in Pokemon Diamond and Pearl. (The Azure Flute Mystery Gift event was never released.) You will need to use an Action Replay or trade for it with a friend.
An Action Replay is needed for Arceus to activate its event and you can capture a Sableye on Iron Island with Pokemon Sapphire inserted in the GBA slot.
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Nobody over GlobalTradeStation can trade you that, since Arceus can't yet be captured legally in Platinum/ Diamond/ Pearl. You can capture Arceus in HeartGold/ SoulSilver though, so either trade with someone in Japan or wait until the American release.
Pokemon Diamond, Pearl, and Platinum have Arceus.
You can catch Arceus in Diamond, Pearl, or Platinum.
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you get arceus at spear piller
I think arceus is the the strongest Pokemon in diamond and pearl. Also no moves are supereffective on Spiritomb and arceus
Yes, Arceus is "The Original One" in Pokémon Diamond and Pearl.