It is said that the sport of Flaaffyball is aptly named, for so much of how it is played is determined by the ball itself. The blue, rubber, electrically charged sphere grows naturally on the tail of every Flaaffy, and is much smaller than the Voltorb, Sandshrew, and other pokemon traditionally used in Goal Roll. (A related game, Mareepball, is not played professionally because of the ball's even smaller size.) Consequently, the ball is not headed or kicked, and the game is instead played with the hands. Furthermore, because it is uneconomical to raise a Flaaffy simply for its ball (the wool and hide being far more valuable) balls are often in short supply, so they are not replaced during a game. Visibility is actually a greater issue early in the game, as dirt and grass which accumulates over the course of the game prevent it from blending in with the sky when thrown.
Flaaffyball is a fast-paced sport, because the ball retains enough of an electrical charge to make it difficult to handle for prolonged periods. It is played by advancing the ball from one end of a grass and dirt field to another, typically by passing, although dribbling is also legal, if difficult because of the rubber ball's unpredictable bounces. Some players make a show of hitting the ball to advance it, but the ball is too small to bat effectively with one's hands and only goaltenders are allowed bats.
Urbanization has not been kind to Flaaffyball; with fields and Flaaffy alike in short supply, it has lost its former dominance. However, it retains legions of passionate fans, a popular professional league, and is by no means a dying game.