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How to Upgrade Items in Pokemon GO Upgrade is one of the most prized items in Pokemon GO. It lets trainers evolve Porygon into Porygon2 and it also gives them the chance to grow in their Pokedex. While this item is quite rare, players can locate it by spinning a photo disc at a Pokestop or as a reward for special events. What is this item used for? Components Upgrade components are objects that can be put into weapons, trinkets, or gathering tools in order to give an attribute bonus or extra effect while the item is being used. They are a