It evolves Porygon into Porygonz.
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The Pokemon that uses the Dubious disk is Porygon2 to evolve him into a porygon-Z
Cheat code of dubious disk is very long but really great so here it is 94005535 FFCF4232
They are the evolutionary items for porygon.
give it a dubious disk and trade it
Yes in route 225...