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A hold item that increases the Base Power of all Ice-type moves by 20%. When held by a Pokemon with the Multitype ability, the holder's type will change to Ice.
Sadly, Icicle Plate is generally useless even on Arceus as Ice Arceus is usually considered to be the worst Arceus forme. Although having Ice-type STAB is rather useful, it is horrid defensively, and it burdens Arceus with many weaknesses with only one useless resistance, and a weakness to Stealth Rock only seals the deal. Ice Arceus is only any use on hail teams, but even then, it is better to use a different type in most cases.
In addition, most other Ice-types find the power boost from Icicle Plate to be too menial.
Abyssal Ruins, 1F.