Porygon2

Porygon2 is the evoulution of Porygon. Porygon is also able to know Conversion, Conversion2, and Tackle like Porygon. To be able to get Porygon2, you must trade Porygon while Porygon is holding Up-Grade. If traded to Diamond or Pearl holding Dubious Disc, it will evolve into Porygon-Z, the pokemon that looks glitched.