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Deals damage. The move's type depends on the user's held item. If the user is holding a Plate item, then the move's type changes to the corresponding type. If it is not holding a Plate, the move is Normal-type.
Oh boy. This is Arceus's exclusive attack, and it's a 100% accuracy move that will change type depending on the held Plate. Since Arceus will always need to carry a Plate to change type itself, this is essentially always a STAB move which also happens to be boosted by the Plate as well, so that Arceus always has a very powerful special STAB move no matter what type it is. For this reason, it is the STAB option of choice on almost all of Arceus's Calm Mind sets.
There are no moves similar to Judgment, though this more depends on the type of Judgment being used. For example, Water-type Judgment is highly similar to Surf, but sports more power, as well as Flamethrower, Thunderbolt, and the like.