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World of Warcraft Item Upgrade and Set Bonuses The upgrade for an item is an enchantment that increases the stats of a specific armor or weapons. This includes secondary stats such as Leech or Speed. A special item for evolution that allows Porygon2 to evolve and become Porygon2. This item can be found at Pokestops or Gyms. Universal upgrades can be applied to any type of equipment and offer lower bonuses when compared to other components that are specific to the type of equipment. Leveling Upgrades allow players to upgrade their items by increasing their levels.