Buy one from the Celadon Game Corner. It costs 9999 coins.
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You give it to a Porygon and trade it, to get a Porygon 2.
Porygon-Z is a Normal type pokemon.
An Up-Grade is an item that evolves the Pokemon Porygon when Porygon is traded while holding it. Porygon evolves into Porygon 2.
Well, suscribe to my page, tell me what you want and how is your Porygon, and let's see if we trade it.
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.