Mewtwo shoots out a short flash from its eyes, and any opponent facing Mewtwo and being right in front of it will be dazed for a short period. If the move is performed on a dazed character the target flies off taking 1% damage, but recovers upon landing. The disable will also send foes flying anytime they are in either a dazed state from a shield break or in an aerial tumble. If the move hits an opponent in the air, they will flinch but instantly recover after the freeze frames, taking no appreciable knockback.
The move is often considered impractical due to its short, narrow range (the opponent must be very close, in front of Mewtwo and at approximately eye level), but it can be used to disrupt an advancing enemy or stun them for a charged smash attack. For a better use, wavedashing into it or jump canceling it allows the player to keep their momentum and reach opponents. Also of note is that the effect of the stun will last longer the higher the foe's damage. Disable is actually a projectile, so alert opponents facing Mewtwo can reflect, powershield, and counter it.
In Super Smash Bros. 4, Mewtwo assumes a lower stance when performing Disable, thus lowering its eye level and allowing for the attack to connect with more enemies that are shorter than Mewtwo. In addition, the cooldown of Disable has decreased, and the stun duration for opponents has been lengthened, making it a very viable strategy to ensure a KO once characters are damaged enough, albeit still a risky maneuver. Disable is also a weight independent attack, but it can't stun fighters if the knockback dealt isn't greater than 0 units.
Special Move customization was added in Super Smash Bros. 4. These are the variations:
Like the other DLC characters, Mewtwo has no custom move variations (aside from the glitch ones in 1.0.6).
Short Hop Disable
Performing Disable while running will stop Mewtwo in place. However, by short hopping first, it can retain its horizontal momentum.
The disable jump is a technique and glitch in Super Smash Bros. Melee. It is triggered by Mewtwo hitting another character with Disable during the initial frames of their up special move. The timing can be hard to dictate, but if the glitch is performed correctly the target will be sent high into the air, past the hoop. The opponent will then become helpless until landing.
In SSB4, Mewtwo can combo into Disable by footstool jumping on a grounded opponent, then immediately double jumping and using the move. This can be set up by using a neutral aerial while facing away from the opponent, although it is difficult to do consistently. This technique has been used consistently in tournament by Mewtwo main Abadango. At Pound 2016 he placed first, showing off this new tech, using it in winner's finals against Marss.
Disable is a Normal-type status move introduced in Generation I. It prevents the target from being able to use a specific move for several turns, though the exact mechanics vary throughout generations. In Generation I, Disable will randomly choose one of the target's moves unable to use for a certain duration of turns. From Generation II and onward, Disable will disable the target's last used move. Its depiction in the Smash series, in which it prevents the victim from moving entirely, is closer to how the move works in the Pokémon anime series and the Mystery Dungeon spinoff games. It is part of Mewtwo's starting moveset in every game.