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I can guarantee Porygon2 will get a new evolution this generation.
According to the Pokedex, the Dubious Disc was nothing more than a virus. And that's just what Porygon-Z is - a virus-ridden computer program. Because of this, scientists will rectify the situation in the new 3D Pokemon game by giving him a proper evolution: Porygon3D. I'll bet he'll lose some speed to become a powerful defensive wall with hard-hitting Special Attacks.