no arceus can not evolv but u can make him change type and form if u give hip a plate to hold e.g. flame plate turns him into a fire type.
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Arceus doesn't evolve because it is a legendary Pokemon
It doesn't evolve or have a pre-evolution
Arceus doesn't have an evolved form; however, you can change his elemental type based on what plate you make him hold. The plates are scattered throughout Diamond/Pearl/Platinum. -DJAikou
You will need to have Arceus to hold a Flame Plate and its Multitype ability will change its type to Fire. You can obtain the Flame Plate in Stark Mountain in Pokemon Diamond, Pearl, and Platinum. Alternatively, you acquire a Flame Plate by showing a hiker in Oreburgh Mine an Arceus in Pokemon Platinum only.
ARCEUS