Rebel's Guard

Rebel's Guard is Joker's Down Special Move in Super Smash Bros. Ultimate. Joker enters a defensive stance which allows him to build up the Rebellion Gauge.

Overview
When initiating, Joker will enter a defensive stance, emitting a blue aura while holding his hand close to his mask. By holding the Special button, Joker will maintain this stance, and any attack that he receives will add to his Rebellion Gauge with their damage halved. When releasing the button, Joker will knock any opponent away from him. Due to its duration, Joker can block multi-hits and combos, and with its quick startup be able to block most attacks on reaction, though he can be grabbed out of it.

Tetrakarn/Makarakarn
Tetrakarn/Makarakarn is Joker's Down Special Move when Arsene is present. Joker retains the defensive stance; however if functions like a counter; if a physical attack hits Joker, he will initiate Tetrakarn, which sends a short shockwave back at the opponent, while intercepting a ranged attack activates Makarakarn, which reflects the projectile.

Origin
While not officially named, guarding in the Persona series allows the user to reduce damage inflicted while reducing the chances of being downed due to an elemental weakness.

Tetrakarn and Makarakarn are support skills in Persona 5. Tetrakarn reflects any single physical attack that hits the user, while Makarakarn reflects any single magical attack that connects. Notably, Arsene cannot learn either move normally but can inherit them from other Personas via Skill Cards or Fusion.

Trivia

 * In Joker's gameplay trailer, Futaba Sakura questions the legality of having a counter and reflector in the same move, despite Palutena and King K. Rool possessing such functionality in Counter/Reflect Barrier and Gut Check respectively.