Without cheats, reacive the mystery gift event for the azure Flute. After you receive the gift, go to Mt. Coronet where you got Palkia/Dialga. It'll ask you if you want to blow the flute. Press yes and a staircase will apear. At the top of the staircase, you battle Arceus at LV. 80
Pokemon Diamond, Pearl, and Platinum have Arceus.
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Arceus
I think arceus is the the strongest Pokemon in diamond and pearl. Also no moves are supereffective on Spiritomb and arceus
arceus
you get arceus at spear piller
Arceus is not possible to find in Pokemon Ruby. It was released in 2007 with Pokemon Diamond and Pearl
Ds action replay.
arceus i believe
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.
In the legend of Pearl, Diamond and Platinum, it is indeed said that Arceus is the creator Pokemon, therefore he created Time and Space, and Pokemon.
You Need The Arceus From 9th Movie or from Pokemon pearl/d/p