you get a poragon in a town a guy in a house gives you one
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To evolve Porygon to Porygon2, you will need to have it hold an Upgrade and trade it. You can get Porygon-Z by having Porygon hold a Dubious Disk and trade it.
Just Evolve Porygon(1). And To Evolve Porygon(1),You Must Trade It.
Trade it whilst its holding an Up-Grade
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.
The Up-Grade Evolvs Porygon When You Give It To It And Trade. You Can Get Porygon From A Woman In Veilstone. When You Get A Porygon2 (If You Have It) Give It The Dubilous Disc And Trade Again And You Get Porygon Z. Hope I Helped :)