The Regi Pokémon meme refers to the collective internet fascination with the Legendary Titans—Regirock, Regice, and Registeel—and their peculiar, robotic cries first introduced in Generation III. The most famous iteration stems from Regirock's audio cry, often phonetically transcribed as 'ÜN ÜN ÜN,' which became a viral sensation on platforms like TikTok and YouTube. These memes typically pair the characters' erratic, mechanical movements with distorted audio or relate their complex Braille-based puzzles to confusing real-life situations. Primarily used in shitposting and 'brain rot' humor, the Regi meme thrives on the nonsensical nature of the sounds and the nostalgic frustration of unlocking them in the games.