It's on route 225. It's a dropped item in a pokeball
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Cheat code of dubious disk is very long but really great so here it is 94005535 FFCF4232
you go to the p2 lab
Mt.Silver
The Pokemon that uses the Dubious disk is Porygon2 to evolve him into a porygon-Z
It evolves Porygon into Porygonz.