Mega Man Zero 1:

Main body:

830019B4 000D

830019B6 0015

830019B8 0019

830019BA 001F

Secondary body:

830019A2 0000

830019A4 0001

Mega Man Zero 2 through 4:

Main body:

83002CDA 001F

83002CD8 0019

83002CD6 0015

83002CD4 000D

Secondary body:

83002CC2 0000

83002CC4 0001

I hope this helps for people who don't like the pink and blue-ish color pallete that Zero has in the MMZ games, maybe they did this because there was no backlight for the original GBA, but Inti Creates still kept it for the ZX games and the DS Collection.