The FINAL Final Battle

The FINAL Final Battle (also known as The True Final Battle in PAL regions) is the final single-player event match in. The player must choose a character and initially take on and. After one opponent is defeated or after a certain amount of time has passed (one minute in hard), appears, and  appears after another one is defeated or time has passed (one minute thirty seconds in hard). Defeating all opponents clears the event.

Progression
This event is unlocked by clearing. Completing the event does not unlock any further paths.

Clearing the event on hard difficulty awards the Souflee trophy on the challenge board, in addition to 10000G.

Trivia

 * The music used in this event, , normally plays on, rather than Battlefield.
 * Mario, Sonic, and Pac-Man are all mascots of Nintendo, Sega, and Namco respectively, whereas Mega Man, while not used as a corporate mascot, is one of Capcom's most iconic characters and seen by some fans as an unofficial mascot.
 * This makes the event similar to Event 41: The FINAL Final Battle in Brawl, where the player had to beat, , and , the prior two of which are mascots of Nintendo and Sega respectively, while the latter is considered an unofficial mascot of Konami by fans.
 * If taken as the "last" solo event in (going by its name, as events are not numbered), this is the first in the series that:
 * Can be unlocked and cleared without clearing all other solo events in the game.
 * Can be unlocked without unlocking all characters, as only, , and are required to unlock it.
 * Does not take place on Final Destination, despite the event icon depicting Final Destination.
 * Does not feature a giant opponent.
 * Does not have unlockable characters as opponents.
 * Features more than three opponents.
 * The final event match in each game has one less stock than the previous game, where Melees has 3, Brawls has 2, and Smash 4's has 1 stock.