You have to have the up-grade then trade it to evolve into Porygon-2 and then a dubilicius disc for Porygon-2 to evolve into Porygon-Z
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An Up-Grade is an item that evolves the Pokemon Porygon when Porygon is traded while holding it. Porygon evolves into Porygon 2.
There is no certain level, porygon evolves when it is traded and is holding upgrade.
Evolves Porygon 2 to Porygon Z when equipped and traded
im pretty sure that porygon 2, given the upgrade and traded evolves in porygon Z
Upgrade,which is an item,is an item that when held by a Porygon and is trade the porygon evolves to porygon 2