J0e Musashi said:
I thought Ryo's was qcf+C-A? I'm fine with the qcfx2+AC one.
That's his SDM, "HDM" or "HSDM" means Hidden (Super) Desperation Move and can only be done when you're in MAX mode and your life bar is flashing.
His SDM is another beast... it's not really hard to pull off, provided you keep in mind that you can only use it after recovering from another move, i.e. during a combo or after a jumping attack, jump, after a knock-down, etc.
For example, you could activate MAX mode, roll towards your opp. and pull off the SDM shortly before your character goes back to his idle stance again. Using it after a standing C, jumping D or even after a normal jump works as well.
Timing for the C~A is a bit tricky, you have to hit C then A -VERY- fast, almost at the same time. For a start, try hitting both C+A and then lower your finger over the C button a little bit to hit C slightly earlier... the C~A is more like a sloppily done C+A than C, followed by A, 'know what I mean.