Porygon 2 and porygon- z
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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.
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
To evolve it into a Porygon2, trade Porygon holding an Up-Grade. To evolve Porygon 2 into Porygon-Z, trade Porygon2 holding a dubious disc
Porygon's level dosen't interfere with it's evolution, because Porygon does not evolve through Level Up. You need to trade a Porygon with another Pokemon game. Once the traded Porygon reaches the other game, it will evolve into Porygon-2.
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.