Similar to the other main Pokémon titles, the story for Pokémon: Emerald takes place over land and sea and pits the player against the Team Aqua and Team Magma from Sapphire and Ruby. This time around, Pokémon will show off their moves prior to battle, as a sort of taunt. Nintendo also added some new options to the game, including a new Battle Frontier area that engulfs seven big battles. The Battle Dome is for tournaments in which only three Pokémon can participate at a time. The Battle Tube has three entrances through which players must then attempt to make their way to their goal. Special Trainers called Frontier Brains have been added, and the rare Pokémon Rayquaza is sighted.