Have a porygon hold upgrade then trade and boom its a porygon 2.
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Porygon 2 and porygon- z
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
Porygon can evolve into Porygon 2, while holding an Upgrade and traded. Even further, Porygon 2 can evolve into Porygon Z, while holding a Dubious Disc and traded.
if you give it to a porygon 2 and then trade it it will evolve into a porygon z to get a porygon 2 you must give a upgrade to a porygon and then trade it and it shall evolve!
If you mean how do you evolve Porygon into Porygon 2, you give it the Up-Grade item and then trade it. But if you actually mean evolve Porygon 2, you can't; Porygon Z wasn't introduced until Generation IV.