Fake cartridges
I believe such cartridges are not allowed for runs. I'm not 100% sure but I think with unofficial cartridges there is no guarantee its hardware will run the game at the same speed as an official cartridge.
Recent runs
I believe such cartridges are not allowed for runs. I'm not 100% sure but I think with unofficial cartridges there is no guarantee its hardware will run the game at the same speed as an official cartridge.