ok first you go to hearthome
city and go down the path and past the polioce and other trainers and go to the mansion and go to the room where that man with the beard next to the guy don't talk to im save at that point and then talk to him until he says porygon cuz u ...well....say lik it says plusle right and says not porygon turn off do it over till says(only one Pokemon per day!)
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The Up-Grade evolves Porygon into Porygon2 =).
It is used to evolve Proygon2 into Porygon-z.
You can find and win an unlimitd amount of Porygon in the Celadon Game Center.
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.
give porygon (or possibly porygon 2) dubious disc ( i think you nick it from galactic hq) and trade him.