I'm not sure if dash dancing is a viable option in Smash 4. Yes, the game doesn't have tripping. Yes, the game has more movement options, but if we're talking about dash dancing in recent Smash games, then that's Brawl dash dancing. I'm almost certain Smash 4's character dash animations are much shorter, limiting the use of dash dancing.
An example of Brawl-style dash dancing (ignore the tripping. Imagine as if the image was a Smash 4 one.)
If I said something stupid please correct me if I'm wrong.
(also tfw they nerf pika QAC in pm 3.5)
An example of Brawl-style dash dancing (ignore the tripping. Imagine as if the image was a Smash 4 one.)

If I said something stupid please correct me if I'm wrong.
(also tfw they nerf pika QAC in pm 3.5)