Like the Poké Ball, the Master Ball releases a Pokémon when thrown, but unlike the ordinary Poké Ball it is almost guaranteed to release a Legendary or Mythical Pokémon. The only exception is the dud Pokémon Goldeen, which deals no damage. Legendary Pokémon can appear from both types of Poké Balls, but a Master Ball is far more likely to contain them. Similarly-functioning Poké Balls previously appeared in Super Smash Bros. Melee in Event 37: Legendary Pokémon.
List of Master Ball Pokémon
Pokémon in this table are listed by their order in the National Pokédex.
In the Pokémon series, the Master Ball is by far the rarest of all Poké Ball variants, with the player usually able to only legitimately obtain one per save file without resorting to lottery-based minigames or trading. Whereas all other Poké Ball types may fail at capturing a wild Pokémon under certain circumstances, a Master Ball will catch any wild Pokémon without fail regardless of their health and status: legendary Pokémon, with their very low catch rate, are thus a prime target for it.
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