Pokémon FireRed Glitches

catching the ghost marowak!!!
Ok.This is a good glitch. but be warned, if you do it you will have to start a new game. after you get the silph scope. go back to pokemon tower, and go to where ghost marowak is then fight if you have a master ball you can catch it!!! but youll have to start over on your game because when you reach the old man he will notcome back with you because he will not sense that marowak is at peace.