Up-Grade is a peculiar item in the Pokémon series, primarily defined by its unique role in the evolution of the Pokémon Porygon. Introduced in Generation II, the Up-Grade is a digitally-themed item that, when held by a Porygon traded between players, triggers its evolution into Porygon2. This item showcases the game's innovative mechanics, as it integrates the concept of digital evolution within its gameplay.
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