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The Upgrade Item in Pokemon GO The upgrade item is a special evolving item in Pokemon GO that can make certain pocket monsters change into stronger versions. It's a key way to master evolution and expanding the Pokedex. Players can purchase upgrade items by spinning Photo Discs in PokeStops and Gyms for seven days in a row, and also by completing events-specific Field Research tasks. These items are rare however they are available. It is used to evolve Porygon into Porygon2