You buy it at the master stadium, or have someone equip it on a manamon and trade it to you. Barring that, if you find a resister, it kicks in when you have something that's at least double weak to a move, though I don't know the amount of damage reduction you get. It used to say, but then it was changed. The ultra snow shield might be better as it's 70% reduction to ice damage I think.
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