Gen 1 has been lucky to be blessed by some very talented programmers who helped make the Gambatte emulator accurate for gen 1 (no different than playing the yellow cart on a gameboy). It is the only emulator allowed for use. Super game boy is banned because it does not accurately emulate the real game. For yellow either gambatte or GBP or GBI are allowed and are all accurate and can all preform the manipulations. You can also potato cam your gameboy :P