Porygon evolves while being traded while holding an Upgrade.
get it to level 20
you trade it while holding an up-grade.
So far my porygon is level 49 and has tackle tri attack zap cannon and psybeam hope i can help =).
lvl 34 or 36, most likely 36
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!
Porygon's level dosen't interfere with it's evolution, because Porygon does not evolve through Level Up. You need to trade a Porygon with another Pokemon game. Once the traded Porygon reaches the other game, it will evolve into Porygon-2.
Porygon doesn't evolve at a level. You need a special item to make it evolve.
you can get porygon in platinum by going to velistone first, and then go to the top house on the top of the Pokemon center.Finally,you ask the man inside the house, then he will give you a porygon level 25.
trade while holding up grade and it will evolve into porygon 2
shoud be the same as pokemon emeraled. it should evelve @ level 40
level 50
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.