To skip Brock, do this. Press start to get the menu. Put the arrow on Save. Press B. In Pewter City go to the guy who takes you to the door of the gym. Try to get the menu up just before you start walking. If you can press save and then turn off the game. Turn the game back on and then the guy will take you to the gym again accept this time instead of being just in front of you he will be a few steps diagonally from you. He will end up on top of the girl who talks about Clefairys. After he leaves you will probably find out he's not where he usually is so go through the place where he was and continue on to Mount Moon. This code doesn't always work!