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What is an Upgrade Item in World of Warcraft? An upgrade item is an item that can be inserted into armor, weapons, and trinkets to boost their effectiveness. It can be obtained by completing certain keystones of high-tier dungeons. Trainers will require an upgrade to develop Porygon into its final evolution, Porygon2. These exclusive evolutionary items are rare and can't be found by spinning PokeStops or Gyms. C