Quote from Chanoire:
My recollection is that it's specifically L and R, not aim up and aim down. Actually, my further recollection is that there's some restriction on L and R so that either only certain commands can be assigned to them or that aim up/down can only be assigned to L/R. Can someone confirm/contradict?
I'm not sure if anyone already answered this...
But I just tried it with aim up set to R and run to L and it worked. So I guess its power bomb holding Down, L, R, and Fire, with less than 50 energy.
I registered to find this out but just went and tried it.