From the Super Mario Wiki
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Plasma Wisps also appear in Super Smash Bros. for Nintendo 3DS as Smash Run enemies. Like in the original game, they fly freely and can fire bolts of plasma at the player. They can attack by using Plasma Needle, which fires off three small, short range, low damage bolts; Plasma Arrow, which fires an arrow-shaped bolt that travels far and can stun players; and Plasma Spark, which fires a large, ball-shaped projectile that travels slow but deals high damage and knockback; this attack also shields the Plasma Wisp and damages the player on contact until fired.
Super Smash Bros. for Nintendo 3DS