Entei is one of the three legendary beasts introduced in Pokémon Gold and Silver, first released in Japan in 1999, and its roar has since become one of the franchise's most recognisable creature sounds. The short cry is shared across games, anime appearances and fan soundboards, where players use it to signal a rare encounter or a powerful opponent. Because Entei remains a fan favourite and regularly returns in new Pokémon games, the roar still works instantly for audiences who grew up with the series.