@Rebel
For your benefit i just went and did a B-reversal video with Captain Falcon for you.
http://www.youtube.com/watch?v=McX0I-mYVxY
He appears to have no Falcon Punch B-reversal, as you can see. However, he CAN B-reverse his side B, and it clearly shows when it's recorded in 1/4 speed like that. He still benefits hugely from being able to B-reverse his side B too.
So at least WRT to "And before people start telling me it's possible with Captain Falcon and Ganondorf, no, it's not", well, yes, it is
But I think you were more looking for a video of a B-reversed Falcon Punch, which doesn't look possible.
To all the people saying it's Melee's turnaround B, stop making yourselves look silly already
More vids up.
Ganondorf's (useless) B-reversals -
http://www.youtube.com/watch?v=tES5AX_WKqc
Ike's (very useful) B-reversals - still encoding on youtube, give it a few minutes.
(.... a few minutes later) edit:
http://www.youtube.com/watch?v=c4jLW9ZxPR4 there you go
Hope you guys appreciate the effort.
re-edit : wow ganondorf's look glitchy as hell haha