Rayquaza

Rayquaza is a legendary Pokémon in the Pokémon series. It is the mascot of the game Pokémon Emerald. It appears in the Subspace Emissary of Super Smash Bros. Brawl.

During the events of the story, it suddenly emerges from a lake after hearing Diddy Kong, who had been looking at the nearly destroyed Arwing nearby. It attacks the Arwing with Dragon Pulse and snatches Diddy in its claws. Diddy screams for help, whereas Fox McCloud, who manages to escape the damaged Arwing, leaps from the Arwing and breaks Diddy free of Rayquaza's grasp using Fox Illusion. Rayquaza, furious, ends up using Dragon Pulse on McCloud, who deflects it with Reflector, flinging it back at Rayquaza, who falls back into the lake.

McCloud and Diddy engage in a fight with Rayquaza, resulting in the second main boss fight of the Subspace Emissary. Some of its attacks involve burrowing into the ground and then bursting upwards. It will also fly with great speed horizontally over the stage and will sometimes drop a Thunder attack. The player can beat it by attacking it around the head. When Rayquaza uses Dragon Pulse, the player can use Fox's Reflector to counter it.

Although Rayquaza does not appear to have any connections with the Subspace Army, it is fought again in The Great Maze.

Trivia

 * Rayquaza is the only non-playable Pokémon and non-Poké Ball Pokémon to get its own sticker.
 * Rayquaza never interacted with anyone from its own series, which is something that Petey Piranha, Porky, and Ridley did.