i think you have to get the dubious disk which i personally don't know how but you give it the dubious disk and trade it then it should evolve into porygon-z which looks really cool but its eyes look like you just hit him on the head with a frying pan hope i helped
It can be used to evolve a porygon2 when equipped and traded
You evolve Porygon2 by giving it the Dubious Disc and then trading it to another player's game.
the only way is either get one on a trade or trade porygon holding up-grade and will evolve into porygon2
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 have to trade with it holding the dubious disk. This can be done when porygon2 is at any level.
you have to have a upgrade and then trade it
train it
It evolves Porygon to Porygon2 through trade.Dubious disc will then change Porygon2 to PorygonZ
Porygon2 will evolve into Porygon-Z once you trade it to another player while it's holdig a Dubious Disc.
you cannot evolve a porygon2 in leafgreen
trade porygon2 with the item dubious disk to evolve the the Pokemon porygon two then get it back
porygon2. give it to him trade and it will evolve.