Lucario

Lucario is a character that thrives on tempo, so being able to generate advantage whenever Lucario loses a stock is the best way to beat the character consistently. The two frame is also a five frame, because on his up b animation, his ears go above the ledge. Most Lucario players know this, and against characters with really strong two frames such as Rob or Palu, they will either skip the ledge entirely or mix up their recovery every single time. Being able to secure early kills is obviously a huge benefit in any matchup, but some characters will have an easier time outplaying the Lucario until a stock is secured simply because they can make it really really difficult for Lucario to play the game out of disadvantage. Characters who have ridiculous kill options like Roy, Ike, Cloud, Donkey Kong, Ken, Terry, so on and so forth can ignore that, because their advantage state will result in a stock 9 times out of 10 anyway. Aura Sphere is a fake charge shot, and loses to almost every move until Lucario reaches max aura (195% on 1-1 stocks). It's also laggy, so if you anticipate a charge shot from Lucario, you can set up a hard punish extremely easily because it leaves him wide open. SDI the aura sphere charge hitbox either hard in or hard out, especially if they use a double jump for the combo, this just makes it harder to react.