A Pokémon that flies endlessly in the ozone layer. It is said it would descend to the ground if Kyogre and Groudon were to fight.
– Pokemon Emerald Pokedex
Rayquaza is the mascot Pokemon of Emerald, being featured on its cover. It’s the master of the sky, whereas Kyogre is the master of the sea and Groudon is the master of the land. Rayquaza is said to appear when Groudon and Kyogre are fighting, and calms them down. Its ability Air Lock ignores the effects of both Groudon and Kyogre’s abilities (though Cloud Nine has the same effect). It’s the first Dragon type mascot Pokemon (before the Dragon type became popular legendary mascots).
In the anime, Rayquaza is featured in the 7th movie Destiny Deoxys. It’s shown to live in the stratosphere, and it fights with Deoxys in the movie because it thinks Deoxys is invading its space. In Smash Bros Brawl, Rayquaza appears as a boss in the adventure mode, Subspace Emissary.
Stat-wise, Rayquaza has high Attack and Sp Attack, in fact, the highest of Flying types, and tied with the highest for Dragon types. Its defenses and Speed aren’t as good as a result, but they’re still good because Rayquaza is a legendary, with 680 base stat. Yet it doesn’t have a signature move like other legendaries with 680 base stats.