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