After you find Porygon you need an Upgrade item and Dubious Disc item. This guide on How To Evolve Porygon In Sword & Shield Isle Of Armor will tell you everything you need to know to evolve Porygon into Porygon2 and Porygon2 into PorygonZ.
Porygon is available after you complete the main story in Isle of Armor, if you need more details, check out our guide on where to find Porygon. Once you have obtained your own Porygon, you’re going to need two things. A friend to trade with and two unique items called Upgrade and Dubious Disc.
How To Evolve Porygon In Sword & Shield Isle Of ArmorFirstly you need to find the two items. The first item, Upgrade, can be found in the Training Lowlands Region near Digger Pa. The other is on an island at the very Southern edge of the map. You need to have Porygon hold Upgrade and then trade it to a friend. Then, once you get it back, give it the Dubious Disc and then trade it again. That will cause Porygon to evolve to Porygon2 and then PorygonZ.
In the Training Lowlands Region. It’s located near Digger Pa, at the cave entrance. Simply head through the nearby long grass and you will find the upgrade item sitting in a Poke Ball next to the rocks.
Once you have both items and trade with a friend, Porygon will evolve twice and you will get both Porygon2 and PorygonZ into your Pokedex.
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