Is it useful to give Arceus a Z-Crystal?

Recently I realized Arceus can change type with Z-crystals. Is this more effective than Z moves? Does it’s judgment type change? Is there a use for this?

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Arceus @ Poisonium ZEVs: 248 HP / 8 Def / 156 SpD / 96 SpeJolly nature- will-O-wisp- poison jab- recover- defogThis set’s niche is checking offensive fairies while also resisting fighting. Poisonium Z lets it one-shot Xerneas. 96 Spe jolly outspeeds adamant mega Rayquaza. The HP and defense EVs let it survive Xerneas’s +2 psychic and psyshock after stealth rock damage.

Arceus @ Ghostium ZEVs: 252 Atk / 4 Def / 252 SpeJolly nature- swords dance- shadow force- substitute- brick breakThis is a decent wallbreaker. Z-shadow force is extremely strong, and the combination of it and brick break is hard to switch into. Ghosts also block rapid spin.

Honestly, it depends.A plate boosts Arceus’s STAB moves by 20% and changes Judgement’s type, while a Z-crystal does what a Z-crystal does. Both change Arceus’s type to whatever type the item corresponds to.

For normal Arceus form, a Z-crystal is pretty useless, as normal Arceus almost always plays the role of support or Extreme Killer. In both cases, Arceus is better off holding Leftovers or a Chople berry.

For most Arceus forms, a Z-crystal is worse than a plate, as the plate also boosts Judgement’s power, giving it consistency rather than a nuke. Also, in most cases, these Arceuses (Arceii?) fit in teams which have a better Z-move user. These include Arceus-fairy, Arceus-electric, Arceus-ghost and Arceus-dark.

For others, a Z-crystal is quite useful, as it allows Arceus to decimate would-be checks after setting up. A Z-crystal is only to be used if your Arceus is a set-up Sweeper, with Swords Dance or Calm Mind. For example, Arceus-ground’s boosted Z-Earthquake finishes Groudon-P and Xerneas, while Arceus-Flying’s boosted Z-Fly finishes bulky Yveltal, Groudon and other checks.It all depends on what you want your Arceus to do.