Darky-Sama
Smash Lord
If you buffer a knee, it's unavoidable. Any other time, Samus will just smack Falcon in the face with a neutral air, which is why I don't recommend using this on her. The timing is far too strict for me to want to use it in a real match, anyway. I don't know about anyone else. Samus isn't but so difficult to work around with Falcon, but attempting this in the middle of a match will probably throw you off A LOT if you mess up, judging that you're playing against a good player.