The Master Ball is a special type of Poké Ball in the Pokémon video game series. It is known for its ability to catch any wild Pokémon without fail, making it one of the most sought-after items in the game. Players typically receive only one Master Ball during their journey, which adds to its significance. In addition to its unique catching ability, the Master Ball is often used strategically for capturing rare or legendary Pokémon, such as Mewtwo or Rayquaza. Its effectiveness and limited availability make it a valuable tool for trainers aiming to complete their Pokédex.