When the Final Smash is used, Joker will rush forward while exclaiming "Ravage them!", and any opponents hit during the initial rush will be placed in the attack. The Final Smash starts by showing Joker, along with three of his fellow Phantom Thieves (either alongside Ann Takamaki, Ryuji Sakamoto and Morgana; or Makoto Niijima, Yusuke Kitagawa and Haru Okumura) in silhouetted form jumping upwards, before a splash screen of all four of them appears. The four of them then rush the enemy at speeds that cause them to turn into blurs, while either Futaba Sakura or Morgana comment on the onslaught. When the attack finishes, Joker lands in front of the opponents, and another splash screen appears with Joker fixing his glove while "The Show's Over" appears next to him.
When "The Show's Over" appears, all captured opponents who are over 100% damage will be instantly KOed; any other captured opponents will instead be dealt additional damage and sent flying. (Without Spirits, this occurs if the opponent was at 62.8% before being hit in 1-vs-1 battles or 64% before being hit in battles with 3 or more players.) In a Stock match, if the move instantly KOing opponents causes the match to end, the match ends on the splash screen without returning to gameplay (along with the announcer's "GAME!" call), persisting onto the victory screen.
If Joker misses the initial rush forward, the player can push the control stick in the opposite direction of Joker to rush backwards and attempt to catch opponents again.
The game cannot be paused for the duration of the move. After the attack is over, any items being held by characters will vanish.
During the attack, Morgana or Futaba will say any of the following lines:
All-Out Attacks are staples of the Persona series, since its introduction in Persona 3. When a player knocks down every enemy in the current battle (whether that be from getting critical hits, from exploiting weaknesses or by the enemy missing with a physical attack), they are then given the option to perform an All-Out Attack, where every currently active party member attacks the opponent relentlessly, dealing significant physical Almighty damage that cannot be voided, repelled, or absorbed.
All-Out Attack is nearly identical to the same move in Persona 5, including the splash screen (called the Finishing Touch), with one major difference: In Persona 5, the defeated opponents are seen gushing high-pressure blood, but in Ultimate this is replaced with sparkles. Likewise, one of Morgana's lines, "Time for some bloodshed!", was altered to "Time for some brutality!" These changes were likely made both due to the game's rating and for flavor reasons, due to the character implications of Joker and his teammates brutally murdering fellow fighters (as opposed to enemy Shadows or Personas).
In Persona 5, the splash screen at the end of the attack is only displayed when the attack defeats every enemy left in the battle; in Ultimate, it is always displayed, regardless if it KOs an opponent or not. The splash screen overriding Joker's victory animation and having the results screen overlaid on top of it if All-Out Attack finishes a battle in Ultimate is identical to Persona 5, wherein the same thing occurs whenever an All-Out Attack finishes a regular enemy encounter.
In Ultimate, every character who appears in the attack appears to be holding one of their best weapons from Persona 5; for example, Ryuji holds Mjolnir and Ann holds the Naraka Whip.
The line Joker says when he uses the Final Smash, "Ravage them!", is a line he says in Persona 5 when his Persona skill is about to kill an enemy or hit its weakness.
In version 3.0.0 of Super Smash Bros. Ultimate, getting an Instant KO with this Final Smash in Classic Mode will prevent the game from progressing if the player had died previously and resumed the round. This glitch was fixed in the version 3.0.1 update.