Porygon is a Normal-type Pokemon that first appeared in Pokemon Red/Blue. By Pokemon Gold/Silver, it gained an evolution in the form of Porygon2, and by Pokemon Diamond/Pearl, it could evolve further into Porygon-Z. The original method of obtaining Porygon2 was by trading it while it was holding an Upgrade. To get Porygon-Z, trainers would then need to have their Porygon2 hold a Dubious Disc and trade it once more. Pokemon Legends: Arceus simplifies the Porygon evolution line by removing the trading requirement.
Unfortunately, Porygon and its evolutions are not easily accessible in Hisui. Players will need to have made some progress in Pokemon Legends: Arceus' story before they have a possible chance of encountering Porygon. To get Porygon2 and Porygon-Z, they'll need to get two evolution items that can either be bought in-game or dropped from the Porygon-line.
How to Catch Porygon
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After defeating Kleavor, odd dimensions called space-time distortions will start spawning around Hisui. A message will appear at the top of the screen when one starts forming. However, it may take some time for the space-time distortion to fully form. When it does, another notification will appear saying "A space-time distortion appeared!"
Porygon and its evolutions will appear in the space-time distortions in the Crimson Mirelands. Like all other Pokemon in the distortions, Porygon will be aggressive and attack the minute it sees the trainer. Stun it with Mud Balls and Spoiled Apricorns, or send out a Pokemon to battle it.
How to Evolve Porygon & Porygon2
The Upgrade and the Dubious Disc are still needed to evolve Porygon. However, since Pokemon can't hold items in Pokemon Legends: Arceus, evolutionary items like the Upgrade/Dubious Disc work like evolution stones. To get Porygon2, use the Upgrade on Porygon. Then, to get Porygon-Z, use the Dubious Disc on Porygon2.
Players can buy the Upgrade from the Ginko Guild, but the items are randomized. A more surefire way to get the Upgrade is by spending 1000 Merit Points (MP) at the Trading Post near Jubilife Village's Galaxy Hall. The Dubious Disc is also available at the Trading Post, but it will cost 1400 MP instead.
Before evolving Porygon into Porygon2, it's recommended to try and get its Research Level to 10. Trainers should do the same with Porygon2. Once players have enough research tasks to fill out Porygon and Porygon2's Pokedex entry, it'll be time to evolve Porygon-Z.
Pokemon Legends: Arceus is available now on Nintendo Switch.