The Pokémon Arceus has been discovered! Little is known about the Normal-type Pokémon, but it's been confirmed that the rare Pokémon is number 493 in the National Pokédex. And what other mysteries surround this Pokémon?
Arceus is heading to Pokémon Diamond, Pokémon Pearl, and Pokémon Platinum Version games, but like Shaymin and Darkrai, Arceus is a Pokémon that won't appear during normal gameplay.
In addition to Pokémon Diamond, Pokémon Pearl, and Pokémon Platinum Version, Arceus will make an appearance in the next Pokémon movie, as well as in future Pokémon Trading Card Game expansion!
Source:
Pokemon.com