If you trade a porygon with an upgrade it will evolve into porygon2 =0
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Upgrade,which is an item,is an item that when held by a Porygon and is trade the porygon evolves to porygon 2
Have a porygon hold upgrade then trade and boom its a porygon 2.
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 give it to a Porygon and trade it, to get a Porygon 2.
You need to trade a Porygon holding an Upgrade. You get an Upgrade from Silph Co building.