Wall jumping is an unlockable ability that allows you to, well, jump off walls you're facing towards. As far as I understand you need to jump up to the wall, depress the jump button, press it again and no matter how long that second press is you jump quite a few ways off the wall. I can't seem to be able to climb any height with it.
...except you can wall-jump. What gives? Has it changed in the new localized version?