The phrase comes from 'Who's That Pokemon?', a recurring segment in the Pokemon animated series that began in the late 1990s during the original run of the show. Each segment showed a Pokemon in silhouette during a commercial break and revealed it afterward, turning identification into a game for young viewers. The clip spread online as a meme sound for guessing games and surprise reveals, helped by nostalgia for the series and by translations in other languages, including Portuguese versions shared on soundboards.
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The Who's That Pokemon sound effect from the Pokemon anime guessing segment, often used for reveals, quizzes and mystery character jokes online.
This clip captures the dramatic question from the Pokemon anime's guessing game, where a silhouetted creature is shown and the narrator challenges viewers to name it before the break ends. The voice delivers the line with bright, theatrical curiosity, stretching the mystery for a few suspenseful seconds. It instantly triggers nostalgia and playful anticipation, because audiences know a reveal is coming. Creators use that built in pause to build tension, tease a hidden object or person, and make the eventual answer feel like a small celebration, even when the subject is completely unrelated to Pokemon.
