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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 power. You can obtain it by completing dungeons with high-level keystones. Trainers will require an upgrade in order to evolve Porygon's final evolution, Porygon2. These special evolution items are scarce and aren't available through spinning PokeStops or Gyms