Ok. Now i'll tell u. If you wanna get the azure flute on Pokemon Diamond you need the action replay or the pokemon's event. If you have the action replay follow my istructions, ok? You have to activate the code and then you have to go to the pokemon mart where you will find a green postman. Talk with him and you'll receive the azure flute. Go where you got Dialga and then... you'll see! You will find Arceus at level 80! Be carefull! Good luck! ;)(if you want follow the video)