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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 in order to boost their performance. You can get it by completing high-tier keystones dungeons. Trainers will need an Upgrade to advance Porygon into its final form, Porygon2. These exclusive items that evolve are extremely rare and aren't available through spinning PokeStops or Gyms. Components In the field of computer technology, an upgrade is a replacement of hardware or software with a new version that offers new functions or fea