The Poké Ball (Japanese: モンスターボール, Monsutābōru, Monster Ball) is an item that if thrown, releases one of a number of Pokémon. Each Pokémon does a different thing, including attacking one's opponent, changing the properties of the stage, and inducing status effects. The Poké Balls in Super Smash Bros. release Pokémon from Pokémon Red/Blue/Yellow, while the Poké Balls in Super Smash Bros. Melee release Pokémon from Pokémon Gold/Silver/Crystal in addition to Pokémon from Red/Blue/Yellow. The Poké Balls in Super Smash Bros. Brawl release Pokémon from the first four generations, which include, along with past generation Pokémon, Pokémon from Ruby/Sapphire/Emerald, FireRed/LeafGreen, and Diamond/Pearl. In Brawl, the Poké Ball makes a unique sound effect when it appears, thus alerting one to its presence even if it appears off screen.
In Brawl, the number of Poké Balls that can be on-screen at once has been reduced to three, instead of the unlimited number of Poké Balls that could appear in Melee. In Training Mode in Melee, a numerous amount of Poké Balls may be taken out, however, some that are thrown may result into letting out no Pokémon at all.
The Poké Ball is also featured as a trophy in Super Smash Bros. Melee and Super Smash Bros. Brawl.
An item used for capturing Pokémon and calling them out to battle. Pokémon live in these items which, despite appearances, actually contain a wide, comfortable, Pokémon-friendly world inside them. In Super Smash Bros., Pokémon give temporary support to whoever calls them out. You never know which Pokémon you'll get, but some of them are devastatingly powerful.
In Brawl, the player has a 1/493 chance of getting a Celebi, Mew or Jirachi, which cause a congratulating announcement window to pop up. The Pokémon also have unique effects:
Celebi hovers, flies off-screen, and drops several trophies.
Jirachi appears and flies off rapidly while dropping many stickers.
Mew drops a single CD and flies away (or a single Sticker if all CDs have been collected).
CPUs in Super Smash Bros. Melee will pursue a Poké Ball, no matter how far, even if it means that the CPU must cease fighting. This is less common in Super Smash Bros. Brawl, but not by much.
The physics of the one who has a Poké Ball has changed between Melee and Brawl. In Melee, unless the Poké Ball is reflected, once a character picks up a Poké Ball, its Pokémon will definitely belong to the character. However, in Brawl, the Poké Ball can now be caught in midair. It also won't release the Pokémon inside if the character drops the Poké Ball via enemy attacks.
The first Pokémon summoned from a Poké Ball in Training Mode also becomes the first summoned in Versus Mode.