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What is an Upgrade Item in World of Warcraft? Upgrade items are items that can be added to weapons, armor and trinkets in order to boost their stats. You can get it by completing dungeons with high-level keystones. Trainers will require an Upgrade to help evolve Porygon's final evolution, Porygon2. These unique items that evolve are extremely rare and aren't available through spinning PokeStops or Gyms. Components In the field of computer technology it is a case of a hardware or software upgrade replaces an older version with a