KirbyKaze
Smash Legend
You wiggle the control stick. I don't know how M2K does his super quick chain stuff. It is largely momentum based, though. You have to do arcs to get height swings or have momentum prior to the height swing. Otherwise it will just flop around and stuff. If you keep it moving, you can keep doing arc stuff, which is pretty much its only onstage use (poking airborne opponents).