Make porygon2 hold a dubious disk Then trade it in order to evolve
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give it a dubious disk and trade it
You cannot. Trade with UpGrade to get Porygon2. Trade Porygon2 with Dubious Disk to get PorygonZ, but you have to trade either way.
You have to trade the Porygon 2 holding an item called "Dubious Disk" to a friend. It should evolve like any other trade-evolving Pokemon.
you have to trade it while its holding an up grade item
Porygon2 evolves by trading with a Dibious Disc