Once you have Arceus Flute (I'm not entirely sure how you get it because I have Action Replay) go up to the spear pillar at the top of Mt. Coronet (were you find Dialga). Play the flute there and a steep staircase should appear. Go up it and Arceus will be at the top. It is Level 80 so be sure to have a tough Pokemon in your first slot.
Hope I helped.
:-D
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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?
Pokemon Diamond, Pearl, and Platinum have Arceus.
arceus
Technically,yes you can get Arceus in Pokemon Heartgold,but only by trading it to your Pokemon Heartgold game from Pokemon diamond,pearl or platinum.
Shaymin, and 463 is Arceus