get the upgrade in the rocket warehouse on Five Island and then trade to another GBA game and then it will evolve. (porygon can be bought at lv. 18 at celadon game corner, and must be holding upgrade to evolve.)
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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
Upgrade,which is an item,is an item that when held by a Porygon and is trade the porygon evolves to porygon 2
An Up-Grade is an item that evolves the Pokemon Porygon when Porygon is traded while holding it. Porygon evolves into Porygon 2.
You give it to a Porygon and trade it, to get a Porygon 2.
if you give it to a porygon 2 and then trade it it will evolve into a porygon z to get a porygon 2 you must give a upgrade to a porygon and then trade it and it shall evolve!