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A hold item that increases the Base Power of all Ghost-type moves by 20%. When held by a Pokemon with the Multitype ability, the holder's type will change to Ghost.
Ghost Arceus is amazingly versatile, capable of being splashed into many teams with any role one could possibly need. This isn't hard to see; Ghost-type STAB has excellent neutral coverage, and defensively it brings immunities to Normal- and Fighting-type moves, most notably Rapid Spin, making Ghost Arceus a staple on teams relying on entry hazards. It is also a deadly Calm Mind sweeper, gaining unresisted coverage with Judgment and Focus Blast, and can also dismantle most physical walls with a mighty Swords Dance set as well.
However, it is generally useless aside from Arceus, as most other Ghost-types find the power boost from Spooky Plate to be too menial.
Abyssal Ruins, 1F.