There is no Unknown Plate for Arceus, there are only plates for each type.
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well...its clearly unknown there no information about it but its used to make arceus into an unkown arceus. that's all i know.
dark blue
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.
It is unknown, as not much about Zecrom is known.
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.