Sorry if this is old news.
I recently was playing around with some random characters as usual and I think I found a way to improve Yoshis aerial game via the heavy armor (or whatever it's called) of the DJump. All you have to do is quickly cancel the 1st jump by immediately jumping twice to go directly into the animation of the 2nd jump. From this position you can go into any aerial battles without suffering knockback. If you get overhelmed by a Marth in teh air you may find this to be a useful way to strike back.
Basically: Cancel the first jump asap and make use of the armor of the 2nd jump.
I recently was playing around with some random characters as usual and I think I found a way to improve Yoshis aerial game via the heavy armor (or whatever it's called) of the DJump. All you have to do is quickly cancel the 1st jump by immediately jumping twice to go directly into the animation of the 2nd jump. From this position you can go into any aerial battles without suffering knockback. If you get overhelmed by a Marth in teh air you may find this to be a useful way to strike back.
Basically: Cancel the first jump asap and make use of the armor of the 2nd jump.