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
Porygon2 doesn't evolve you need to trade it holding a dubious disk
You have to trade with it holding the dubious disk. This can be done when porygon2 is at any level.
No
Porygon2 does not evolve.
You evolve Porygon2 by giving it the Dubious Disc and then trading it to another player's game.
Make porygon2 hold a dubious disk Then trade it in order to evolve
To Evolve Porygon2 you need the Dubious disc found in route 225 Give the D Disc To Porygon2 and Trade it to a friend and get it back or put it in the Deposit Box In the GTA for... (Legendary) Level 9 and Under, Then take it back. It will Evolve into PorygonX
Porygon does not evolve at a given level: you have to trade it while it is holding the Up-Grade to evolve into Porygon2. Then trade that while holding the Dubious Disk to get a PorygonZ.
You can give the Upgrade to Porygon and then trade it to a friend to make Porygon evolve into Porygon2, in order to evolve Porygon2 then give a Dubious Disc to Porygon2 and then trade it to someone and it'll evolve into a Porygon-Z.
Porygon-Z is the final form of Porygon (and Porygon2). To evolve Porygon to Porygon2, trade it while it holds an Up-Grade item. To evolve Porygon2 to Porygon-Z, trade it while it holds a Dubious Disc item.
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.
Porygon2 will evolve into Porygon-Z once you trade it to another player while it's holdig a Dubious Disc.