PokéBase - Pokémon Q&A
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I know it sells for a large price but i have a feeling its used for SOMETHING important for evolving or something.

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You trade a Porygon 2 holding the Dubious Disc. Then it will evolve into Porygon-Z.

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i thought it was up-grade
No. That's from Porygon to Porygon 2.