Besides Dragon Warrior 2 and Final Fantasy 1+3, which games used it?
Just Breed uses it during a whole flashback, where the screen is in black and white.
DW1 uses it when you cast spells to make the screen flicker.
SMB3 after you complete a castle
Noah's Ark (European game)
Why do you need to know?
RYGAR, produced by TECMO in 1987
when using ATTACK-ASSIST ( use 5 mind point ),
it will change between color and mono mode to make a flash effect.