eiquip it to porgon then trade it to get a porgon 2
you have to beat the trainers and the time in that place on seven island
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.)
To evolve Porygon when it holds the item 'upgrade' and it is traded over to another game. It will evolve into Porygon2.
if your talking about the item called upgrade than you can use it evolve porygon into porygon 2 when you link trade it.
Raise to level 20.
in the trainer tower . it is a reward.
eiquip it to porgon then trade it to get a porgon 2
you will find it on island 7 when you complete the battle tower
give it to a porygon and trade it to another person and it evolves into a porygon2
you have to beat the trainers and the time in that place on seven island
Porygon evolves while being traded while holding an Upgrade.
You must evolve Porygon (From Celadon) using the UpGrade to Porygon 2.
You can't unless you trade a Pokemon holding one from FR or RSE.
You need to trade a Porygon holding an Upgrade.You get an Upgrade from Silph Co building.
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!
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.)