You are legally safer downloading a Pokémon ROM (which is still illegal, just less enforced) than a Minecraft one because Microsoft has automated bots scanning for "Minecraft" in file names. The search for a "Minecraft GBC ROM download" is a wild goose chase based on YouTube art projects and a non-functional tech demo. The websites that promise this file are lying to you to infect your computer.
The GBC’s Z80 processor runs at 4.19 MHz. Modern phones run at billions of cycles per second. Even the map loading screen of Minecraft requires more RAM than the entire GBC system has for both code and graphics combined. minecraft gbc rom download
On YouTube, talented pixel artists have created incredible mock-ups of what Minecraft would look like if it ran on a GBC. Channels like 64 Bits or The Geek Critique have produced fake "trailers" or "concept art" showing Steve mining dirt with a green-tinted HUD. These videos rarely state they are fakes in the title, leading to confusion. You are legally safer downloading a Pokémon ROM