Mr. Derp
Smash Apprentice
I've played roy for a while, I just never post here cause the roy forums are pretty dry 
. anyway, I've never seen it donme outside of myself but something I've been doing lately on floaties who are hareder to combo is d-tilt, jump and when I am at thier level DED first hit, once I'm on the other side of the opponent I DED again. from there you have a few options as far as I can tell, you could do the ->->V DED and try to coninue to juggle them after they are launched. you can fall to the ground hit them with an up tilt(you should be reaching the ground before they do) and juggle them again. with proper timing, when an opponent is over the edge, you can jump out so that you are just below them, hit with first DED and then spike them with your forhead, makes a real fancy ending to a match. there are other possibiliteswith this that I'm not think of, but you get the idea. sorry if this has already been discovered/ proven not to work.
. anyway, I've never seen it donme outside of myself but something I've been doing lately on floaties who are hareder to combo is d-tilt, jump and when I am at thier level DED first hit, once I'm on the other side of the opponent I DED again. from there you have a few options as far as I can tell, you could do the ->->V DED and try to coninue to juggle them after they are launched. you can fall to the ground hit them with an up tilt(you should be reaching the ground before they do) and juggle them again. with proper timing, when an opponent is over the edge, you can jump out so that you are just below them, hit with first DED and then spike them with your forhead, makes a real fancy ending to a match. there are other possibiliteswith this that I'm not think of, but you get the idea. sorry if this has already been discovered/ proven not to work.
