You can't
you have to get the arceus event on mystery gift.
What is the che cheat to get an arceus in Pokemon diamond? What is the che cheat to get an arceus in Pokemon diamond? What is the che cheat to get an arceus in Pokemon diamond?
the best Pokemon in diamond is arceus, but you have to use action replay or wi-fi mystery gift
There was a special mystery gift that gave you the flute and you go into the place you found dialga.
NO, you need action replay for it . the azure flute is for arceus.
the only way to get arceus is via a mystery vent in japan only sorry
you cannot catch arceus but you can get it as a MYSTERY GIFT you from trading with DIAMOND/PEARL/PLATINUM.anyway i hope you enjoy your arceus.
trade or hacks
you need the azure flute i think you get it from mystery gift then go to a Nintendo event
You can't.
Without mystery gift event: Rotom, Heatran, Azelf, Mesprit, Uxie, Cresselia, Giratina, Regigas and Dialga WIth event: Darkrai, Shaymin, Manaphy, Phione, and Arceus! (arceus is the best and hardest one!)
definitely a Nintendo event