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The Dubious Disk is for Porygon or Porygon 2. Trade one of the Porygons with a real live friend, and it will evolve into a Porygon Z.

Also you need the Up-Grade from Professor Oak to get Porygon - Porygon 2. you can also trade it over from platinum you go to the house in veilstone closest to team galactics base and there will be a man in it u get it from him (you may need national dex and im not sure about diamond i havent gotten national dex yet in diamond)

Make sure you don't use GTS because you have no way to get it in time. But if you do it with a friend, make sure their not a thief.

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14y ago

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