Question

I know you need an Up Grade and a Dubious Disc for the Porygon Evolutions. So, I have a Dubious Disc, but how do I get an Up Grade?

Answer 1

Gold Silver Crystal -Kanto: Silph Co
FireRed LeafGreen -Rocket Warehouse, Trainer Tower (Defeat Single Mode)
Diamond/Pearl -Eterna City (From Professor Oak)
Platinum -Route 224, Eterna Galactic Building
HeartGold SoulSilver -Kanto: Silph Co

Answer 2

You talk to professor oak in eternal city and he will give it to you. After you get the national pokedex.

Comments

Where is he in eterna?

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The house near the cycling road entrance.

Answer 3

Get it from professor oak, trade porygon with upgrade for porygon2, thean with dubious disc for porygonZ