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New held items that change a Pokemon's ability when certain circumstances are met in battle. For example, one changes the Pokemon's ability to Snow Warning if they're caught in any other type of weather, while another changes a Pokemon's ability to Volt Absorb when struck with an electric attack. Except they've given fancier-sounding names like "Snowy Phantom" and the Pokemon glows when their ability has changed.
Oh, and they can only be equipped to a Pokemon of a corresponding type.