Pokémon Odyssey · Guide Pokémon Odyssey Upgrade Location: How to Evolve Porygon Upgrade is an evolution item used to evolve Porygon into Porygon2 in Pokémon Odyssey. Unlike the usual main-series method, you do not need to trade Porygon while it holds the item. Open your Bag, use Upgrade on Porygon, and the evolution begins. What…