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The Upgrade Item in Pokemon GO The upgrade item in Pokemon GO is a special evolution item that helps certain monsters in the pocket become more powerful. It's an important step to mastering the evolution and expanding your Pokedex. Players can purchase upgrade items by spinning Photo Disks at PokeStops and Gyms for seven days in a row and also through event-specific Field Research tasks. However they have a low drop rate. It is used to transform Porygon into Porygon2.
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