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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 is obtained by completing high-tier keystones dungeons. Trainers will require an Upgrade in order to evolve Porygon's final evolution, Porygon2. However, they cannot grab one by spinning PokeStops or Gyms These special evolving items have a low drop rate. Components In computer technology the term "hardware" or software" refers to a ha