Arceus is a Legendary Pokemon that is obtained from Prof. Rowan after completing your Sinnoh Dex. You will receive Arceus in it's egg form - the egg will not break your shiny chain.
Arceus is breedable, with the EggGroup "Legendary". Arceus can only be bred with a Ditto to produce more Arceus Eggs. If the Arceus Egg is obtained from the Daycare, it will count for your shiny chain.
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Arceus does not evolve.
Arceus can change forms with Plates, which can be found when opening Mystery Boxes