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What is the dubious disk for?Up grade?

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I don't know what they are used for....

asked Nov 27, 2013 by redring345

1 Answer

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They are used to evolve Porygon to Porygon 2 and Porygon-Z respectively. Trade Porygon with Up-Grade and you get Porygon 2; trade P2 with Dubious Disc then it evolves into Porygon Z

answered Nov 27, 2013 by TonyZ
selected Nov 28, 2013 by redring345