Hmmm... I'd easily change the cloned Final Smashes.
Falco: Arwing - He jumps into an Arwing ("Personally, I prefer the air!") and this can be controlled. The Arwing can be flown around at high speed (similar to Super Sonic) but not as freely, as it turns like a Landmaster and isn't as loose in up/down controls as SS. You can also fire lasers with A (unlimited and does more damage/knockback than just ramming opponenents), fire a bomb with B (only one per Final Smash, but it acts like a Smart Bomb), and barrel roll with L or R (knocks opponents who are hit upwards rather than sideways). You only have this for a little while, obviously.
Wolf: Team Star Wolf - Wolf calls down his Team, who reply in little boxes Star Fox style, and then bombard the stage with lasers, missiles, and bombs for a short while. Wolf can attack separately and is unaffected by his Team's fire.
Toon Link: Wind Waker - Toon Link whips out his baton and begins to conduct. He first plays the Wind’s Requiem and then heavy wind begins to blow on the stage. The player can tilt the control stick to change the direction the wind blows, and, while the wind does no damage, it easily pushes opponents off the stage. As the time to control the winds nears its end, the winds gradually grow stronger.
Lucas: PK Love - No idea what this would do, as I've sadly never played a Mother game, but he and Ness shouldn't have the same Final Smash. Or moves, for that matter, but that's not what this topic's about, is it?