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How to Upgrade Items in Pokemon GO Upgrade is among the most prized items in Pokemon GO. It allows trainers to evolve Porygon into Porygon2 and gives them the chance to advance in their Pokedex. It is a rare item, however it can be obtained by spinning a Photo Disc at a Pokestop or as a prize at special occasions. What does this item do? Components Upgrade components can be added to weapons, trinkets or gathering tools in order to provide them with an additional benefit. They are a crucial com