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.
buy at game corner.
You must evolve Porygon (From Celadon) using the UpGrade to Porygon 2.
you cannot evolve a porygon2 in leafgreen
It evolves porygon to porygon2
Porygon evolves while being traded while holding an Upgrade.
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
You need to trade a Porygon holding an Upgrade.You get an Upgrade from Silph Co building.
you can only buy it from the game corner in the city with erika
you trade it while holding an up-grade.
give it to a porygon and trade it to another person and it evolves into a porygon2
So far my porygon is level 49 and has tackle tri attack zap cannon and psybeam hope i can help =).
Upgrade,which is an item,is an item that when held by a Porygon and is trade the porygon evolves to porygon 2
you need i think 9999 coins from the game corner, either 9999 or 6500, but after you have enough coins you go to the house next to the game corner in celadon and buy a porygon