Who's That Pokémon was a recurring segment in the Pokémon animated series, in which viewers were shown only a silhouette and asked to name the creature before it was revealed. The format became a familiar part of watching the show, and the jingle itself became instantly recognisable even without the picture. Online, creators revived it as a template for guessing games, unboxings, character reveals and quiz clips, often hiding the answer until the last second. Its simple call-and-response structure is why it still works for short videos today.