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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 increase their stats. It is obtained by completing dungeons with high-level keystones. Trainers will require an upgrade to help evolve Porygon's final evolution, Porygon2. However, they cannot take one from spinning PokeStops or Gyms as these unique evolution items have a very low drop rate. Components In the field of computer technology, an upgrade is an upgrade of software or hardware with a version that includes new functions or features. T