You must win it at the Celadon City Game Corner.
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It evolves Porygon into Porygonz.
You can find and win an unlimitd amount of Porygon in the Celadon Game Center.
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.
You give it to a Porygon and trade it, to get a Porygon 2.