Rayquaza is a legendary dragon Pokemon introduced in Pokemon Ruby and Sapphire, where players encounter it at the Sky Pillar, and it later became the mascot of Pokemon Emerald. Its distinctive cry has been reused across later Pokemon games, animated appearances and fan-made media, helping it stay familiar to several generations of players. On soundboards and in short videos, creators reuse the short clip as a shorthand for power, rarity and a legendary entrance, which is why it remains popular long after its original games.