You must have the cheats "Azure Flute". Blow the flute on top of Mt.Coranet. Stairs will appear. Climb them and you'll find arceous. Hope this helped.
ROSIE6000 HERE! the newest Pokemon is arceous. find out more at Pokemon.com!
ar only
its arceous u duma$$
Event
You need to be more specific. LUCKILY, I know what your reffering to. You are talking about the arceous event in diamond/pearl/platinum. He will be in any pokemart in a green suit. After you have activated the event.
Azure flute by event
Learn How to spell "Arceus". >.>
you go and poop on your game. Then you give your game to me.
the most powerfull Pokemon is Zaurauk the 5th genaration . No arceous is
you will need the azure flute at the spear pilar, at the peak of mount coronet
It can only be traded from D/P/Pt. It was only available in special events.