Ness defending himself with PSI Magnet.
|Article on WikiBound||PSI Magnet|
PSI Magnet (サイマグネット, Saimagunetto; called Psychic-Magnet in Super Smash Bros.) is the down special move for Ness and Lucas. It absorbs certain projectile attacks (mostly energy-based rather than physical objects). Upon absorption, the attack lowers the user's percent (or replenishes their health in Stamina Mode). The user cannot be healed to a percent lower than zero or higher than their starting HP, usually 150HP (Stamina Mode). The move also differs slightly between the two characters that use it.
Ness' PSI Magnet is formed centered around his body, covering his entire body with it. When released, Ness's Magnet pushes enemies and some items (such as Snake's Grenades) away from his body. In Super Smash Bros. 64, the move has very high starting lag, making it nearly useless; in return though the crowd releases very enthusiastic cheers for its successful use. In Melee, it is now blue instead of green and is much faster, making it more reliable. In Brawl, the color changes again, from blue to a more purplish color.
Lucas' PSI Magnet is formed centered around his outstretched hand, and thus the magnet doesn't fully cover the area behind him. However, Lucas will instantly turn around when hit from the back, which means the field essentially covers his whole body as well. Lucas's version of this attack has a hitbox when released, which deals 9% damage and horizontal knockback. Additionally, Lucas recovers slightly more percentage than Ness when he absorbs a projectile, but not significantly.
 Tactical uses
When used in the air, this move will cancel any vertical/falling momentum temporarily. This allows for this move to be used as a pseudo-SHFFL if used immediately after a jump, or a pseudo-wavedash if the player activates the move at a downward diagonal angle. Using C-sticking special moves control scheme for the Gamecube Controller, this move, used right after PK Fire for Lucas, will allow the wavedash to work much more easily.
When a projectile is absorbed, if the player taps the control stick/pad (depending on controller) in a direction, Lucas or Ness will either roll in that direction, sidestepping, or jumping without having to release the attack first.
PSI Magnet first appeared in Mother and has appeared in later Mother games since. However, in the Mother series, neither Ness nor Lucas learn the move. In all three of the Mother games, the move involved the player absorbing an enemy's Psychic Points (or PP) and adding it to that player's PP (takes 10 PP in Mother and 2-8 PP in EarthBound and Mother 3). There was also a move in the Mother games called "Lifeup", which was a psychic move that Ness and Lucas could use to recover a player's Health Points (or HP). Also, PSI Magnet can absorb energy projectiles from other players in the Super Smash Bros. games, but since Ness and Lucas don't have limited PP in the Super Smash Bros. games, it instead recovers a small amount of health. PSI Magnet recovering damage could also be a reference to Lifeup. 
 Description from the Melee instruction booklet
Absorb enemy energy attacks and recover health.
 Description from the Brawl instruction booklet
Absorb projectiles to reduce Lucas's damage percentage a corresponding amount.
Ness absorbing Master Hand's Bullets with PSI Magnet in SSB
- In the original Super Smash Bros., level 5 and above CPUs will almost never use the Fire Flower against Ness, because he can absorb the fire with PSI Magnet. Instead, they will throw the flower at him. This also applies to Fox, who can deflect the fire with his Reflector.
- The attack can be put to incredible use on the Corneria stage, by absorbing the Great Fox's lasers. However, if Ness or Lucas touch the cannons while they are "charging", it's almost guaranteed to KO them. Only the actual laser shots can be absorbed.
- Ness's PSI Magnet changed color throughout all three games, from green, to blue, and finally purple.
 See also