Mewtwo first appeared as a legendary psychic Pokemon in the original Pokemon games and anime, created from the DNA of Mew, and later became one of the most sought-after encounters in Pokemon Go. In the mobile game, Mewtwo appears in high-level raids, where groups of players battle together to catch it, and its cry plays when the encounter begins. Clips of that raid boss sound spread through gameplay videos, streams and fan edits, where it became shorthand for a rare, high-stakes challenge. It remains popular because Mewtwo is recognised as one of the franchise's strongest and most iconic legendary Pokemon.