Hisui is a character from the Pokémon franchise, specifically introduced in the games set in the Hisui region. This region is a historical version of the Sinnoh region and is featured in the game Pokémon Legends: Arceus. Hisui is known for its unique Pokémon and landscapes, reflecting a time when humans and Pokémon coexisted in a more primitive setting. In the context of the game, Hisui serves as a backdrop for players to explore and complete the first Pokédex. The region is characterized by its diverse environments, including mountains, forests, and lakes, which are home to various Pokémon species, some of which have regional forms unique to Hisui.