Sootopolis is located in a crater formed by a volcano, only acessible through diving or flying, and is home to the Legend of the creation of the Hoenn region, the Cave of Origin, the final stage of the near catalysmic battle between Groudon and Kyogre. This is also the final stage set to battle the Strongest Gym Leader of all of Hoenn, a Water Pokemon master, so be prepared for a epic battle.