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Causes Porygon2 to evolve into Porygon-Z when traded while holding it. This consumes the Dubious Disc. In Pokémon Legends: Arceus, due to the absence of held items, the Dubious Disc simply needs to be used on Porygon2 to trigger the evolution, which consumes the item.
Porygon-Z's Pokédex entries imply that the Dubious Disc was modified to enable it to work in alien dimensions, but that an unplanned error in the programming corrupted Porygon-Z and prevented it from fulfilling this purpose.