you have to have the item "upgrade" attached to your porygon and trade it, it will evolve after it's been traded.
also if you want porygon z, you can do the same thing only attach "Dubious Disc" to it (:
evolve porygon from veilstone city
you give porygon the upgrade then trade it to get a porygon 2 then you give your porygon 2 another upgrade and trade yet again to get a porygon-z
Not really, no. There is a trainer that has Porygon 2 on Platinum, I forgot the area but I can tell you later. That is if you haven't met the collector.
I believe the only method to obtaining Porygon 2 is by evolution. You do this by giving a Porygon an 'Up-Grade' item and trading it.
you must trad a porygon holding an up-grade
An Up-Grade is an item that evolves the Pokemon Porygon when Porygon is traded while holding it. Porygon evolves into Porygon 2.
trade while holding up grade and it will evolve into porygon 2
Have a Porygon hold it and trade it.When the other person gets it, it will evolve into a Porygon-2.
In Pokemon Platinum (I don't know about Diamond and Pearl), Porygon is located in a house directly behind the Pokemon Center. If you want to evolve into Porygon 2, trade it holding a Up-Grade, and if you want to evolve Porygon 2 into Porygon Z, trade it holding a Dubious Disk. I do not know where htese items are found. If you want to get Porygon the harder way, use Pokecheck.
In Pokemon Platinum, Porygon-2 can evolve into Porygon-Z using the Up-Grade. I do not believe it serves any other purposes.
You go to celestic town then go to the left to mt. cornet then go north the first trainer you find has porygon 2
one of the scientist in the galactic warehouse.