Upgrade is an evolutionary item that is needed to evolve Porygon into Porygon2. You need the Upgrade and 25 Candy to get Porygon2. The same Mega Battle Challenge quest will get you a Sinnoh Stone, which will once again be necessary to evolve Porygon2 into Porygon-Z. You’ll need that Sinnoh Stone and 100 Candy for the final form.
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