Double jump cancel

From SmashWiki, the Super Smash Bros. wiki

The double jump cancel is a tactic used by Ness, Mewtwo, Peach and Yoshi, who can attack immediately after their double jump to cancel their upward momentum and land on the ground soon after their attack. This tactic is used to perform aerial attacks incredibly quickly, thus allowing aerial combos and KO's to be performed more quickly.

But other characters who can cancel their double jump use this tactic to cover more horizontal distance and reach enemies who are further away. Mewtwo players generally only double jump cancel when they want to attack opponents who are out their range.

For Peach, this tactic is usable, but generally unused due to her slower aerials and superior float cancels. The pro peach user XIF is known for using multiple djc neutral air.

For Yoshi, he can use this to "Counter" attacks because of his second jump ability.

One obvious downfall of this tactic is that the character loses their double jump, possibly resulting in a self-destruct when near an edge.

Double jump cancel has been completely removed in Super Smash Bros. Brawl.