Porygon2 evolves by trading with a Dibious Disc
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You have to trade with it holding the dubious disk. This can be done when porygon2 is at any level.
Make porygon2 hold a dubious disk Then trade it in order to evolve
Porygon2 is a 2nd gen pokemon and does not appear in Pokemon Red. That aside, both of Porygon's evolutions occur when you trade it while it holds certain item. Up-Grade for Porygon to Porygon2, and Dubious Disc for Porygon2 to Porygon-Z.
To evolve your Porygon2 into a Porygon Z, you have to trade your Porygon2 to a friend while it is holding a Dubious Disk.
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