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World of Warcraft Item Upgrade and Set Bonuses The upgrade to an item is a kind of enchantment that increases the stats of certain weapons or armor. This includes secondary stats like Leech and Speed. of evolution that allows Porygon2 to evolve and become Porygon2. This item is available at Pokestops or Gyms. Universal upgrades can be used on any type of gear and offer less benefits than other components that are equipment-type specific. Leveling Upgrades allow players to upgrade items by increasing their levels. The item's "guaranteed bonuses" are