PokéBase - Pokémon Q&A
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The Dubious Disc will cause Porygon2 to evolve into PorygonZ when traded holding the item. That's its sole purpose.

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Aw will, I tryed...I thought that was about the disk you recived from the P2 lab for Genesect to use...
I didn't knowtic that porygon can evolve?!
Porygon evolves into Porygon2 when traded holding an upgrade and then into PorygonZ when traded holding a dubious disk. Both of its evolutions are awesome
Im going try that!