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A hold item that increases the Base Power of all Dark-type moves by 20%. When held by a Pokemon with the Multitype ability, the holder's type will change to Dark.
Although Dark-type Arceus isn't as useful as Ghost-type Arceus, who has more useful immunities, Dark Arceus has the advantage of having no Pokemon immune to its STAB. The Dread Plate turns Arceus into a fantastic Calm Mind abuser, and with the help of Recover and Refresh, it can often muscle through even the most solid of stall teams and defensive walls, sometimes by itself.
However, it is generally useless aside from Arceus, as most other Dark-types find the power boost from Dread Plate to be too menial.
Abyssal Ruins, 1F.