Sootopolis is a unique city in the Pokémon world, located within a volcanic crater. It is known for its stunning scenery, featuring clear waters and lush vegetation. The city is home to the Sootopolis Gym, where trainers can challenge the Gym Leader, Wallace, who specializes in Water-type Pokémon. The city is also significant in the storyline of the Hoenn region, where it plays a key role in the battle between the legendary Pokémon Kyogre and Groudon. Sootopolis is accessible through underwater caves, making it a hidden gem for trainers exploring the region.