Light Dash

Light Speed Dash (ライトスピードダッシュ, Raito Supīdo Dasshu), also known simply as Light Dash, is 's side special move in Super Smash Flash 2. Sonic stands still while saying: "Ready..." When Sonic charges the move in midair, the move slows your descent, and it leave you helpless after attacking. Sonic releases the move while yelling "Go!" and shoots diagonally upward in a way similar to Wolf Flash from Super Smash Bros. Brawl, and gives the user two frames of invincibility. While charging the attack, Sonic will flash yellow, and after he is done charging the attack, he'll release it. There is a sweetspot at the very end of the attack that will have a very powerful effect if the victim is caught in its range.

Origin
In Sonic Adventure, one of Sonic's upgrades is the Light Speed Dash, which can make Sonic do a better spin dash and follow a specific line of rings. Also, the attack reappears in Sonic Adventure 2, Sonic Heroes, Shadow the Hedgehog, Sonic the Hedgehog (2006), Sonic Unleashed, Sonic Colors (Green Wisp (Wii)), Sonic Generations (Modern Sonic) and Sonic Lost World (Red and Green Wisps (Wii U))

Trivia

 * Prior to version 0.7 of the demo, Light Dash worked differently. Sonic would curl up into a ball and begin charging the move, much like his Spin Dash, but rather than being able to control him upon releasing the button, Sonic shoots straight forward.
 * Another fan game based on the Super Smash Bros. series called Super Nuke Bros. Melee, has Sonic's side special changed to Light Dash. Also, both of their movesets in both games are very similar.
 * In previous versions, the Light Speed Dash differed little from the Fox Illusion beside longer range and charge time. In version 0.9, before the new patch, however, the attack has changed in functioning from a great recovery move to a great KO attack. If Sonic hits an opponent with a fully charged light speed dash, the is a good possibility to KO the opponent. On Final Destination, Sonic was able to KO Mario in the middle of the stage at 40% damage. This now gives Sonic another KO move in comparison to Brawl. It's not as strong, but it is still a good KOing move.