Ubisoft is the only french gaming studio I can think of. And they tend to make pretty good games. If you can find them in french. I would -highly- recommend Beyond Good and Evil if that can be found in french. If their native dialog and story-telling are as good as the american version it'd be a definite treat

I downloaded a lot of ROMs for my GBA emulator for my PSP and a LOT of them seem to be international. So French seems to be an option a lot. Could look into finding international versions of GBA games you like. I can't really think of any actual recommendations that would be strictly text though. I'm not sure what franchises Ubisoft did back then. So I think international GBA might be your best bet