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Pokemon GO Upgrade Items and Components An upgrade item is an item that will make certain Pokemon develop. The upgrade can be made by spinning a PokeStop photo disc. It's sometimes given as a prize in Pokemon GO events. Upgrades can be applied to armors, weapons trinkets, weapons, and gathering tools to boost their level. The upgrade costs Flightstones and crests, based on the type of item. Upgrade components Upgrade components can be inserted into weapons, armor trinkets, trinkets, or gathe