I'm not sure, but I maybe think you mean Judgement.
The type of Judgement varies with the kind of Plate user is holding.
Arceus learns Judgement at level 100
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You now have an Arceus in your team! Nothing special happens
Arceus is not able to learn any move like Mew can. However Arceus is able to learn a large amount of moves from TMs making it a very versatile Pokemon.
Attack is the stat that determines the power of a physical move. sp attack is the power of the special move for example judgment does 100 damage but if the arceus has a higher attack than sp.attackthis move will only damage 100 rather than 145
No, I highly doubt it.
special distribution coming in probably 1 to 2years