The Ultra Ball is a type of Poké Ball used in the Pokémon series to catch wild Pokémon. It has a higher success rate than a standard Poké Ball, making it more effective for capturing Pokémon, especially those that are rare or difficult to catch. The Ultra Ball is characterized by its distinctive black and yellow design. In the games, players can obtain Ultra Balls through various means, such as purchasing them at Poké Marts or finding them in the wild. They are a popular choice among trainers, especially when attempting to capture legendary Pokémon like Mewtwo or Rayquaza.