In regards of Frisk, my interpretation is that it removes any property of an item that directly causes your pokemon some damage or status (like Expert Belt or Destiny Knot). If the item fit into this criteria then it's allowed, even if some part of it does, for example, against Rare Candy Suicune you would still have to deal with 5/5 defenses, but the +2 BAP on water attacks is negated
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