User blog comment:XenoRalph/Favorite Final Smash/@comment-25374264-20150815200126

Critical Hit. It always has a 100% chance of KOing the opponent, regardless of their current damage. In my opinion, all Final Smashes should be one-hit-KOs, considering they're called Final Smashes, even though some of them only kill if the opponent has at least 50% damage.

Ike's is pretty good too, I guess.