From SmashWiki, the Super Smash Bros. wiki
Plasma Whip is
Zero Suit Samus' Side Special Move. It shoots the Plasma Whip forward a long distance, with small knockback and damage throughout its length, except for a fairly large sweetspot at the tip. The body of the whip can knock the enemy into the tip, which has large knockback (at least as large as Samus's Forward Smash, but with longer range). The move is a little laggy after extending, but comes out at about the speed of a smash attack. In the air, it can be used as a
Tether Recovery; it differs from her other tether move, the
Plasma Wire in that it has longer horizontal range, but much less vertical range, giving Zamus several options for Tether recovering, depending on whether she is level with or below the ledge. The Plasma Wire can also grapple ledges that are below Zero Suit Samus's level, which can be useful for varying up her recovery.
