So of course, as the title says, Ganon has a super jump. No, you can't use it in the air, so don't try to do it to recover.
Anyway, this glitch is pretty simple.
First, go to a flat stage like Final Destination, Battlefield, Smashville, etc. Go to the edge of the stage and look on the stage, not off the stage. Just make sure you're on the edge.
Then, use Ganondorf's B-down and right when he stops (you'll see him do a little flip), press the jump button and B-down at the same time. It may be hard to do that, so you can change the settings to make it easier.
Anyway, if you did it right, he would do the super jump. If you did it wrong, you probably weren't exactly on the edge, or you didn't push the buttons at the same time.
That is all. :)