Give porygon an upgrade and trade it it evolve it. And of course you have to trade it back. Try this in Pokémon go!
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the Pokemon that evolves with upgrade is porygon. give it to porygon and trade it to someone. after trading, it will evolve. You'll have to get it back though...
If you give It to the pokemon porygon and trade it then it will evolve
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.
You need to trade a Porygon holding an Upgrade. You get an Upgrade from Silph Co building.
if your talking about the item called upgrade than you can use it evolve porygon into porygon 2 when you link trade it.
In order to evolve Porygon into Porygon2, you must give it the Upgrade item and then trade it to another game.