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World of Warcraft Item Upgrade and Set Bonuses The item upgrade is a type of enchantment that improves the stats of certain armor or weapons. This includes tertiary stats like Leech or Speed. A special evolution item which allows Porygon2 to evolve into the game Porygon2. This item is available at Pokestops or Gyms. Universal upgrades are able to be used on any kind of equipment and provide smaller bonuses than other components that are equipment-type specific. Leveling The upgrade system