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.
Chat with our AI personalities
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
The Pokemon that evolve using a thunderstone are: Pikachu into Raichu Eevee to get a Jolteon
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.