Just Evolve Porygon(1).
And To Evolve Porygon(1),You Must Trade It.
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It is impossible to obtain a Porygon2 without trading. You can get a Porygon and trade it with an Up-Grade or you can get a Porygon2 from the GTS but there is no way to get Porygon2 without trading.
A dubious disc is a hold item for Porygon2. If you trade a Porygon2 that's holding a dubious disc, it will evolve into Porygon-Z.
The only known Pokemon to evolve using the up-grade is porygon. It will evolve it into porygon2.
Not one hundered percent sure but i think its the one that evolves porygon in porygon2 OR its the item that evolves porygon2 into porygon-Z
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.