Fox Illusion is Fox's side special move introduced in Super Smash Bros. Melee. When using it, Fox suddenly dashes forward at a high speed, damaging any opponents in his path with an after-image. In Super Smash Bros. Melee and Super Smash Bros. Brawl, Fox is left in a helpless state after using it in midair, although the move can be stopped by pressing the special move button again; in Super Smash Bros. for Nintendo 3DS / Wii U, this no longer occurs, and Fox automatically stops moving at the end of a ledge if used on the ground, and can no longer be stopped mid-attack. Falco and Wolf's equivalents to this move are Falco Phantasm and Wolf Flash, respectively.
In Super Smash Bros. for Nintendo 3DS and Wii U, the Fox Illusion's first custom variant is Fox Burst, which no longer deals damage during the attack but creates an explosion at the stopping point that deals greater damage and knockback. The second is Wolf Flash, which behaves similarly to Wolf's move in Super Smash Bros. Brawl; it does not travel as far but gives Fox some vertical distance and a sweet spot the end of the move that behaves as a meteor smash.
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