you can get porygon in platinum by going to velistone first, and then go to the top house on the top of the Pokemon center.Finally,you ask the man inside the house, then he will give you a porygon level 25.
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An Up-Grade is an item that evolves the Pokemon Porygon when Porygon is traded while holding it. Porygon evolves into Porygon 2.
Porygon
In veilston city behind the Pokemon center in that house that man gives you a porygon
Just Evolve Porygon(1). And To Evolve Porygon(1),You Must Trade It.
In Pokemon Platinum, Porygon-2 can evolve into Porygon-Z using the Up-Grade. I do not believe it serves any other purposes.