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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 increase their stats. It is obtained by completing certain keystones of high-tier dungeons. Trainers will require an Upgrade in order to evolve Porygon's final evolution, Porygon2. But, they won't be able to grab one by spinning PokeStops and Gyms as these unique evolving items have a low drop rate. Components In the field of computer technology it is a case of a hardware or software upgrade replaces an older vers