transfer and trade systems
it evolves porygon to porygon2 when traded.
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.
you have to link trade porygon
You cannot catch Porygon2 in the wild, you will have to trade a Porygon holding an Up-grade to evolve it into Porygon2.
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.
The Up-Grade evolves Porygon into Porygon2 through link trade. Then Dubious Disk evolves Porygon2 into Porygon-Z.
It evolves porygon to porygon2
yes with the up-grade
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
Give Porygon an upgrade to hold and then trade it. Also, if you want a Porygon-Z give Porygon2 a Dubious disc to hold and then trade it.