Cauterize
Smash Cadet
Idk if this has already been found, but I thought I would share it. As far as I know sheik's upB can only hit once, but by dashing towards a ledge and using upB right before you fall off, it can hit twice :o
http://www.youtube.com/watch?v=nkLVK4wmZSE
http://www.youtube.com/watch?v=nkLVK4wmZSE