Porygon2 is a 2nd gen pokemon and does not appear in Pokemon Red. That aside, both of Porygon's evolutions occur when you trade it while it holds certain item. Up-Grade for Porygon to Porygon2, and Dubious Disc for Porygon2 to Porygon-Z.
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Just Evolve Porygon(1). And To Evolve Porygon(1),You Must Trade It.
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Used on porygon to evolve to porygon2
To evolve Porygon to Porygon2, you will need to have it hold an Upgrade and trade it. You can get Porygon-Z by having Porygon hold a Dubious Disk and trade it.
In order to evolve Porygon into Porygon2, you must give it the Upgrade item and then trade it to another game.