MTKO
Smash Journeyman
This technique is actually called a cross-up and it's pretty awesome I don't see many people use it to it's full potential.If you hit their sheild with the end of the hitbox, you'll wind up in your lag behind their sheild, and its tough/impossible for them to punish. How do YOU use dash attack?
Falco can do this with his dash attack as well. Also, using his dair and landing behind them, then shining, up tilt, or anything else is good. Sometimes people even attempt to grab after a cross-up (I do this a lot out of habit and should work on stopping), especially crossed up dash attacks because they assume the opponent is going be in grab range in front of them after shield stun wears off. Then they grab and often get punished (shine to start a combo with falco, f-tilt with sheik and so on.)