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What is an Upgrade Item in World of Warcraft? Upgrade items are items that can be added to armor, weapons and trinkets in order to boost their stats. It can be obtained through the completion of certain high-level keystone dungeons. Trainers will require an Upgrade to help evolve Porygon's final evolution, Porygon2. These unique evolution items are scarce and aren't available through spinning PokeStops or Gyms. Components In computer technology, a software or hardware upgrade replaces an older version with a fresher version with additional features