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How to Upgrade Items in Pokemon GO The Upgrade is one the most important items in Pokemon GO. It lets trainers evolve Porygon into Porygon2 and also allows them to progress in their Pokedex. Although this item is rare, players can find it by spinning an image disc at a Pokestop, or as a reward during some special occasions. What does this item do? Components Upgrade components can be added to trinkets, weapons or gathering tools in order to give them an adde