First you will need to complete your pokedex and national dex then and defeat elite four then youse action replay to get the heavan pipe to catch arceus.
You have to go to a certain Nintendo event to get one.
go to a Nintendo event to get heavens pipe then go to spear pillar stand on the symbol dialga was on use heavens pipe then stairs appear go up the steps arceus is there lv. 80
The "heavens pipe" or "Azure Flute" can be obtained by either a Pokemon event or an action replay
Two Ways: 1. Use Action Replay 2. Wait for the Nintendo event, go to it, and have it put into your game.
use the azure flute
go to were the shamen is
From serebii.net: The Heaven's Pipe can only be obtained through a Nintendo event so far. To use it, you must bring it to the location where Dialga or Palkia originally were. Upon bringing the Heaven's Pipe to this location you will have the option of playing it. When you do, a set of stairs will appear. These stairs will take you to the Beginning Dimension where the legendary pokémon Arseus resides. This is the only known use for the Heaven's Pipe so far
you eat cheese and milk then u poo on apokeball
srry u have to go to a Nintendo event 4 it
where is heaven's pipe in Pokemon diamond i have the action replay
Yes. You can get it by going to mount coronet after getting the heavens pipe from a special event
everyone happy and wifi connection.then save your game, turn it off, then turn it back on. when you get to the options, where wifi connection is, it will say mystery gift.click on one of the options and you will soon have the azure flute.(warning:this is for diamond, for pearl it is the same thing but you get the heavens pipe.the heavens pipe for areceus on pearl, azure flute for diamond)