The Up-Grade evolves Porygon into Porygon2
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If you trade a porygon with an upgrade it will evolve into porygon2 =0
well first you gotta get a porygon. then let it hold the upgrade. then trade it and you'll get porygon 2. trade again with dubious disc to get porygon z. Only Porygon needs Upgrade and you need that upgrade to trade for it to evolve. You need to trade it together with the upgrade for it to evolve.
Give porygon an upgrade and trade it it evolve it. And of course you have to trade it back. Try this in Pokémon go!
If you give It to the pokemon porygon and trade it then it will evolve
You need to trade a Porygon holding an Upgrade. You get an Upgrade from Silph Co building.