The Smash Ball (スマッシュボール, Smash Ball) is an item in Super Smash Bros. Brawl and Super Smash Bros. 4. It allows the user to activate a powerful Final Smash attack when it breaks. It only appears in Training Mode, certain Events, standard and Special Brawls, not the main one-player/co-op modes such as The Subspace Emissary.
To use the Smash Ball, the characters must attack the Smash Ball until it breaks. A 'fresh' Smash Ball can take around 43% damage. When a player successfully breaks one, the screen darkens, and the player whose attack broke the Smash Ball goes into 'standby mode', in which the character's eyes turn yellow and body begins to glow a rainbow color. In Smash 4, an additional aesthetic occurs where the entire screen fades into a deep grey color and causes everything to look dark except the player with the Final Smash, who glows with the Smash Ball's colors. The Final Smash can then be unleashed at any time by pressing the input for a neutral special move. After using a Final Smash, the character is no longer in standby mode and must break another Smash Ball to use a Final Smash again. When the attack has ended the terrain will also go back to its standard colors. If a character takes enough damage while in standby mode, there is a chance that they may 'drop' the Smash Ball, which then begins to move about the screen again. Any assistants such as Poké Ball Pokémon and Assist Trophies can help break the Smash Ball for the character who summoned them.
When a Smash Ball appears, the screen blinks and the crowd gasps. The Smash Ball then moves around on its own, potentially making it harder for players to break. As an item, it can be turned off in the Item Switch option for those who wish to battle without the potential imbalance that comes from such powerful attacks.
The apparent physics of the Smash Ball tend to vary. While it will often bounce off of walls and hard platforms, it will occasionally pass through them. The amount of knockback it takes also varies; sometimes, it will take an attack without even changing its trajectory, and other times an attack will send it halfway across a stage. The camera treats Smash Balls the same way that it treats characters. Smash Balls do not vanish by being forced off the stage like other items, so a Smash Ball sent off the screen can pull the camera away from the characters, though it may fly back shortly after.
If no one breaks the Smash Ball after a long enough period of time, it flies away and is lost. However, the longer it is flying around, the easier it is to break. It can also be damaged by the stage (for example, Norfair's lava), and will be lost if broken in this way. Smash Balls are also affected by glancing blows; the Smash Ball will not take damage but will be pushed away. While a character is in standby mode, no Smash Balls will appear until the Final Smash is used (or the Smash Ball is dropped), meaning that only one Final Smash can be used at a time.
Gradually, the Smash Ball appears to be a colorful sphere of pulsating color that is designed with orthogonal lines, making it somewhat resemble an X Bomb, with a different effect.
Description from the Super Smash Bros. Brawl instruction booklet
Destroy it and unleash a Final Smash with B.
This item is also available as a trophy, with random availability. It is a fairly common trophy to collect.
Smash 4 Trophy