to change it's type. (splash plate=water type,etc)
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There is no Unknown Plate for Arceus, there are only plates for each type.
See the following link for a complete listing of Plates and their locations: http://bulbapedia.bulbagarden.net/wiki/Plates
Arceus is a Normal-type Pokémon but if you give it plates to hold it will change its type to the plate's type.
You have to give it the plates you find. He changes to the type that it would normally boost the power of.
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