The Sport Ball (Japanese: コンペボールCompe Ball, short for Competition) is a type of Poké Ball exclusive to National Park's Bug Catching Contest. It is as effective as a standard Poké Ball. When entering the contest, the player is given a set of twenty Sport Balls. In HeartGold and SoulSilver the ball is redesigned to look like a regular Poké Ball with an additional "Eye" at the top.
The Sport Ball is similar to the Safari Ball and the Park Ball as all are used exclusively in their respective parks to capture Pokémon.
Unlike the Safari and Park Balls, Sport Balls only catch Bug (and Bug dual type) Pokémon, as they are only used (legitimately) in the Bug Catching Contest, where only Bug Pokémon can be caught.