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What is an Upgrade Item in World of Warcraft? An upgrade item is an item that can be put into armor, weapons, and trinkets to increase their stats. It is obtained by completing high-level keystones dungeons. Trainers will require an Upgrade to allow them to advance Porygon's final evolution, Porygon2. But, they won't be able to grab one by spinning PokeStops or Gyms; these special evolutionary items have a low drop rate. Components In the field of computer technology the term "hardware" or softwa