Rayquaza is a legendary Pokemon introduced in the main series games' Hoenn era, and its cry became familiar to players through battle screens, encounters and later appearances across Pokemon media. Online, the sound spread through Pokemon edits, matchup videos and short meme clips that use the cry as a fast way to signal power, rarity or a sky-dragon reveal. It still gets reused because the audio is brief, instantly recognisable to fans and dramatic enough to sell a legendary entrance without needing any extra setup.