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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 performance. It is obtained by completing certain keystones of high-tier dungeons. Trainers will need an Upgrade to evolve Porygon into its final version, Porygon2. These unique evolutionary items are rare and cannot be found spinning PokeStops or Gyms. Components In computer technology, a software or hardware upgrade replaces an older version with a more recent version with additional features or function
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