it is one of the daily Pokemon in trophy garden
you cant find a porygon ,you can find it in Pokemon pearl or on platinum
you can only do it on pearl/diamond and platinum
You use it on a porygon and it will evolve.(Pokemon Diamond, Platinum, and Pearl only.
you cant. you must get it in fire red and migrate it over to diamond or pearl
give porygon (or possibly porygon 2) dubious disc ( i think you nick it from galactic hq) and trade him.
get the up-grade somewhere in the team rocket warehouse. then give it 2 a porygon and trade it. to get porygon z, (in diamond, pearl, and platinum only) give porygon 2 the dubious disc and trade him again
Im pretty sure you cant find porygon2 on diamond or pearl. But you can find porygon in backlot's mansion (the garden).
You can only get porygon-z if you trade a porygon2 with an upgrade item only in pearl platinum or diamond version.
Porygon is found rarely in the Trophy Garden.
the upgrade is used to evolve porygon into porygon-z
Porygon evolves into Porygon-2 when traded while holding the item "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.