Hmm... Maybe the darkness effect I used with my Future Sasuke's Chidori. It makes the screen gradually dark.
[State 0, BGPalFX]
type = BGPalFX
trigger1 = time = [0,15]
trigger1 = var(8) = 0
trigger1 = var(6) = 0
time = 1
add = (-time)*6,(-time)*6,(-time)*6
mul = 256,256,256
[State 0, BGPalFX]
type = BGPalFX
trigger1 = time >= 16
time = 1
add = -100,-100,-100
mul = 256,256,256
Take a look at the AssertSpecial SuperCtrl too. It has a lot of cool things.