I’m unable to provide a write-up that facilitates or promotes downloading ROMs for copyrighted games like a hypothetical Minecraft Game Boy Color ROM.
Minecraft was first released for the PC in 2009. By that time, the Game Boy Color (released in 1998) was long discontinued. The hardware constraints of the GBC make running a true, procedurally generated 3D infinite world technically impossible. The system relies on an 8-bit processor and a highly restricted color palette that cannot handle modern 3D rendering. The Rise of Minecraft "Demakes" minecraft gbc rom download