Master Ball

The Master Ball is an item from the Pokémon series and is a more powerful version of the Poké Ball. In the games, it is generally given to catch rare and Legendary Pokémon due to its catch rate of 256, allowing it to catch any wild Pokémon it is thrown at. It is introduced as an item in the Super Smash Bros. series in Super Smash Bros. for Nintendo 3DS / Wii U, where it appears as a variant of the normal Poké Ball item, usually only releasing Legendary or Mythical Pokémon (including Zoroark, who does not fit into those categories); occasionally, however, a Master Ball may also release Goldeen as a dud.

Master Balls reappear in Super Smash Bros. Ultimate.

Super Smash Bros. for Nintendo 3DS / Wii U
Blue indicates exclusive to the Wii U version.

Names in other languages
Meisterball