How do you get Arceus easily on Pokemon diamond?

Answer 1

To catch Arceus you need the Azure Flute. (This can be obtained through mystery event/ Action Replay codes. You can buy an Action Replay at GameStop for about $25) Once you have obtained this, go back to the Mt Cornet. Once your there, a message will appear. Click 'yes' and you'll play a song. Once that's done, stairs will appear. Walk up them and on the last step SAVE. (After that, you walk up to Arceus and go into a battle) Use a Masterball if you have one, and if you don't be aware Arceus has a catch rate of 3. Lower Arceus's health low, (Be aware he has Recover & Refresh) try putting him to sleep or paralyzed. Then just start lobbing Timerballs, which will work best after 5 turns. (4x catch rate) Arceus's Moves at level 80 in the Wild (when he appears) Refresh, Recover, Hyperbeam, and Future Sight. Good Luck.