go to veilstone go to the house above the Pokemon center.make sure in your party there is a empty space.then talk to the man and he'll give you a ponygon.let it hold a up-grade then trdae with a friend of brother/sister. it will evole.if they have a dubiliuos disc and let it hold it then trade it will evole.when a Pokemon hold an item and trade to make it evole they will go away.but if u let a Pokemon hold a item but it wont evole it the item will be there. ponygon-ponygon-2-ponygon-Z
Link trade Porygone while it holds the Up-Grade
You need to trade polygon while it's holding the item "Up-Grade"obtained in the rocket warehouse on island 5 or 6.
Trade it to another game while holding the Up-Grade.
You can give the Upgrade to Porygon and then trade it to a friend to make Porygon evolve into Porygon2, in order to evolve Porygon2 then give a Dubious Disc to Porygon2 and then trade it to someone and it'll evolve into a Porygon-Z.
The dubious disc is used to evolve PORYGON2 into PORYGON-Z a new version exclusive to Diamond/Pearl/Platinum. To evolve PORYGON2 make it hold the disc and trade to a friend then get them to trade PORYGON-Z back.
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.
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
you have to link trade porygon
you have to have a upgrade and then trade it
Just Evolve Porygon(1). And To Evolve Porygon(1),You Must Trade It.
trade while holding up grade and it will evolve into porygon 2
you have to get a porygon, then trade it with an upgrade, then you have to trade porygon2 with a dubious disc, which is found in the team galactic headquarters in veilstone city.
Have a Porygon hold it and trade it.When the other person gets it, it will evolve into a Porygon-2.
Give Porygon an upgrade to hold and then trade it. Also, if you want a Porygon-Z give Porygon2 a Dubious disc to hold and then trade it.
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 :)
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.
you give it to porygon and trade it and it evolves into porygon2