[State 450, EnvShake]
type = EnvShake
trigger1 = AnimElem = 7
time = 20
freq = 60
ampl = -4
phase = 90
;ignorehitpause =
;persistent =
This is the envshake I have for P.Dizzy. It shouldn't be too hard to figure out. And by AnimElem, that's the frame of the attack you want the shake to happen.