oh shet!! Inguilt, isn't that what you guys been trying to figure out!!??
I'm on it already.
Anyways translation on the description for you non-japanese people:
nvm I was trying it and I see the real input now.
because you have to input the up smash on the first frame, it requires you to use the c-stick for the dash attack, spot dodging allows you to practice it easier.
spot dodge->buffer a dash attack by inputting side c-stick up or down->c-stick up right after.
the timing for the buffer is about the second time diddy flashes. and don't slam your analog stick or else you'll do a fsmash instead.
I'm starting to get it so I'll post a video with my clicky sound so you know the timing :3
heres the video:
http://www.youtube.com/watch?v=4ew-rThiWvM
its right around 25 seconds.
I found out its easier if you input the dash attack using c-stick down instead of up. that way you can go down then up, and its 10 times easier, I did it 3 times in a row that way.