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
you cannot evolve a porygon2 in leafgreen
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.
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.