DD spirit animal journey:
1) Do the one player glitch and pick a long flat stage ( I like stadium cause of the lines ).
2 ) Dash dance along the stage. Practice max range dash dances, short range dash dances, and everything in between. Practice transitioning from one type to another. Practice moving to different parts of the stage using dash dancing. Practice until you have full control of your dash dance and can start doing any range of it on the spot and transition to any other range in a dime.
3) Shadow Dance. Pretend their is an enemy fox also dash dancing across from you and practice baiting by constantly adjusting the distance between the tip of his and your dash dance and the size of your dash dance. Keep it random and avoid patterns go from big to small to slowly getting big to medium for awhile, etc just don't fall in to a pattern.
4) Practice short bursts of dash dancing as if you are in front of a prone enemy. Practice pivot f smash, airials and grabs from this. If you don't have someone to practice with, it's fine to use a CPU. They are predictable, but you can use them to get a feel for what variations of your dash dance cover what techs.
5) Remove mindless dash dancing from your game. Have a reason for doing it, think what you want to bait out. This is the fruition of your practice and is the hardest step.
6) ??? I don't know this is as far as I have gotten.