Trade a Porygon to a friend while it holds the item Up Grade when it's traded it will evolve then ask for Porygon2 to get it.
You must evolve Porygon (From Celadon) using the UpGrade to Porygon 2.
Upgrade,which is an item,is an item that when held by a Porygon and is trade the porygon evolves to porygon 2
you cannot evolve a porygon2 in leafgreen
get the up-grade somewhere in the team rocket warehouse. then give it 2 a porygon and trade it. to get porygon z, (in diamond, pearl, and platinum only) give porygon 2 the dubious disc and trade him again
you can't. dubious disc is to evolve porygon 2 into porygon z, porygon z is a sinnoh Pokemon and leaf green only goes up to hoeen
Porygon evolves while being traded while holding an Upgrade.
It evolves porygon to porygon2
give a porygon an up-grade to hold (found in team rocket warehouse) and trade it with a game that is leafgreen or firered but it has 2 have the national pokedex, or u can trade it 2 a more recent game
get porygon up to a good level, then give the upgrade or dubious disc to porygon, then trade it and trade it back, if you give it upgrade, you will get porygon2, if you give it dubious disc, you get porygon-Z! yay!
To get Porygon in Leaf Green you must have 6500 coins. Go to Game Corner in Celadon City and exchange your coins for a Porygon.
You need to trade a Porygon holding an Upgrade.You get an Upgrade from Silph Co building.
there is porygon-2 but not porygon. porygon-2 is in oil field hideout