Sinnoh is one of the regions in the Pokémon world, introduced in the fourth generation of Pokémon games. It is known for its diverse landscapes, including mountains, lakes, and forests. The region is home to many unique Pokémon species, including the legendary Pokémon Dialga, Palkia, and Giratina. The Sinnoh region features the Pokémon League, where trainers compete to become the Champion. The main city, Sunyshore City, is known for its lighthouse and electric-type Pokémon. Sinnoh also has a rich history, with ancient ruins and the Sinnoh Mythology that explores the creation of the Pokémon universe.