Both Ness and Lucas use PK Starstorm as their Final Smashes. It hits most of the stage (without damaging the character who used the Smash Ball) and damages every character it hits with high knockback.
Lucas's PK StarstormEdit
When Lucas uses his Final Smash, he unleashes a barrage of meteorlike PSI power. As the Final Smash ends, the stars rain down all at once, making it harder to dodge them.
Ness's PK StarstormEdit
Ness's Final Smash is a bit different from Lucas's. When he unleashes it, the stars are blue and fall in a fan-shaped pattern.