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World of Warcraft Item Upgrade and Set Bonuses The item upgrade is a form of enchantment that improves the stats in specific weapons or armor. This includes secondary statistics such as Leech and Speed. A special item for evolution that allows Porygon to transform into Porygon2. This item is available at Pokestops or Gyms. Universal upgrades are able to be used on any type of gear and provide smaller bonuses than other equipment-type components. specific. Leveling The upgrade system lets players enhance items by increasing their level. The level