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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 to boost their stats. You can obtain it by completing high-level keystones dungeons. Trainers will require an Upgrade to allow them to advance Porygon's final evolution, Porygon2. However, they cannot get one by spinning PokeStops and Gyms; these special evolution items have a very low drop rate. Components In computer technology an upgrade is the replacement of software or hardware with a version that provides new functions or featu