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How to Upgrade Items in Pokemon GO Upgrade is one of the most sought-after items in Pokemon GO. It lets trainers transform Porygon into Porygon2 and allows them to grow in their Pokedex. While it is rare, players can locate it by spinning a photo disc at a Pokestop, or as a reward for special events. But what does this item actually do? Components Upgrade components are things that can be slotted into trinkets, weapons, or gathering tools to provide an additional bonus or effect while the item is being ut