Engetsuzan

Engetsuzan, also referred to as Shunpō , is 's side special move in Super Smash Flash 2.

Overview
When performed by Ichigo, he holds his sword back and then quickly dashes a far distance straight forward to perform a slash in front of him. The move can be charged for a short period of time, with the move traveling farther and dealing more slash damage and knockback the more the move is charged: 8% with no charge and 10% with a full charge. When dashing forward, he uses a technique called "Flash Step" in which he completely disappears until the slash at the end to create the illusion of teleportation, and an afterimage of himself is created where the move is used. Ichigo is completely invincible in this state and opponents hit are dealt the same amount of damage and knockback as they would be from the slash.

Because of the speed and invincibility Ichigo has while dashing, the move is useful for maneuvering around the stage and dodging attacks. However, it also suffers from some startup and ending lag, making it easier to punish and vulnerable to certain lingering attacks. The far distance it travels makes it a useful horizontal recovery tool, though it also leaves Ichigo helpless at the end.

Origin
Engetsuzan is a Zanjutsu technique in the Bleach franchise in which the user runs towards their opponent and performs an outwards slash, often dragging their sword along the ground. This technique was first performed by Byakuya Kuchiki to destroy Ichigo's Shinigami power. Notably, Ichigo uses this attack during his fight against Hexapodus to cut off one of its legs, but he doesn't dash during the attack.

The game Bleach: The Blade of Fate has a variation of this attack that much more closely resembles the version used in SSF2, with Ichigo dashing before using the slash attack. Unlike in SSF2, however, this version of the move does not make use of the Flash Step, so Ichigo will stop in his tracks upon making contact with an opponent.