The Perius Battle Dome puts challengers through a bracket not unlike the one in the Hoenn Battle Dome:
- "Before each battle, the player can find out about their opponent, such as the Pokémon they use, their battle style, and how they train. Then, both Trainers choose two Pokémon from their three-Pokémon party to use in battle. Competitors can find out who was eliminated in each round by looking at the tournament bracket." -Bulbapedia
Unlike the Hoenn Battle Dome though, it primarily focuses on battles that take place on (or below!) aquatic terrain.