The UV printed Game Boy Advance shells are pre modified for the Cleanjuice USB-C rechargeable battery module. These shells all have unique base colors, so below is a guide to help you figure out which USB-C battery cover will match perfectly with your UV shell!
YOSHI >>>>>> WHITE
KIRBY >>>>>>> WHITE
MEW >>>>>> > WHITE
MEWTWO >>>>> SOLID BLACK
MEGA MAN >>>>> CLEAR BLACK
DARK LINK >>>>>> BLACK
GENGAR >>>>>>> CLEAR BLACK
JET SET RADIO >>>>> MINT
PIKACHU >>>>>> GOLDEN SUN
BULBASAUR >>>>> WHITE
DONKEY KONG >>>>> GOLDEN SUN
CHARMANDER >>>>>> WHITE
SQUIRTLE >>>>>>> WHITE
ENTEI >>>>>> CLEAR BLACK
INDIEMANDER >>>> CLEAR BLACK