A Plate is a held item that raises the power of the holder's corresponding-type moves by 20%. When held by Arceus, its typing and its signature move Judgment become the type of the Plate, and any corresponding-type moves, including Judgment itself, receive the power boost.
There are 17 different types of plates, following the number of available Pokémon types.
List of Plates
The Pixie Plate used to have a crafting recipe as well. This recipe no longer works.