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How to Upgrade Items in Pokemon GO The Upgrade is among the most important items in Pokemon GO. It allows trainers to evolve Porygon into Porygon2 and it also allows them to progress in their Pokedex. This item is rare but it is available by spinning a Photo Disk at a Pokestop or as a prize during special occasions. What does this item do? Components Upgrade components can be added to weapons, trinkets or gathering tools in order to give them an additional benefit. They are a crucial component for crafting