The game only works well on a Gameboy Emulator. It works both on gbc and gba, but the course is all messed up. So please use a Gameboy Emulator when playing it

Which gameboy emulator is recommended? I tried VBA but that has graphic errors.

bgb or gambatte (i'm using bgb, personnaly).

VBA should never be used, not good enough for GB and too inacurrate for GBA as well.