You’re not alone. As one of the more unique Pokémon, Porygon’s evolution process isn’t as straightforward as leveling up or using a simple stone. But don't fret, in this comprehensive guide ...

For more help on Pokemon Sun and Moon ... being traded to hold a certain item in order to trigger an evolution. In the case of Porygon, that item is called Up-Grade which evolves it into Porygon ...