Question

What is the ??? type arceus ring?

Answer 1

The ??? type Arceus actually existed in Gen 4. Here's it's sprites:

However, like the other answer says, it is inobtainable except through hacking.

Arceus has the Ability Multitype, which changes its type and appearance depending on the Plate it is holding. Likely as a precaution for Arceus hacked to be ???-type, a ???-type sprite of Arceus is present in Pokémon Diamond, Pearl, Platinum, HeartGold, and SoulSilver; however, it is never otherwise used without hacking.

Source

Comments

that arceus looks sick

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^^^


Truer words have never been said.

Answer 2

The ??? Arceus was an Arceus form that could never be obtained legitimately. It could only be obtained in games where the ??? type existed, those being Generation 4 games. Generation 5 onwards, the Arceus form was cut from the game, as there is no ??? Plate.

Hope I helped!