The Walk Through Walls gameshark code has always bean fun and useful to people. Now you can do all that without a gameshark.
Requirements: Must be able and know how to do the Glitch City glitch.
Pokemon with high HP or a lot of potions (preferably both).
Step One) Get all the Pokemon in your party poisoned. (It helps it you only have one Pokemon)
Step Two) Do the Glitch City glitch but stop after step four. Do this while keeping your Pokemon alive.
Step Three) Like you normally would you need to walk 500 steps but this time there is a twist. Your 500th step needs to be off a ledge. Again do this while keeping your Pokemon alive.
Step Four) If you timed this right then you should be in the Safari Zone entrance building, and be able to the walk through walls. But wait there's a catch, you cant leave. If you go into the Safari Zone you can't walk through walls anymore, and same if you go out into Glitch City. So how do you leave? Remember that your only Pokemon is poisoned? Walk around until your Pokemon faints.
Step Five) Your now at the last Pokemon center you visited. You also can walk through walls.
Copyright (c) 2003 - 2009 Glitch City Labs Team. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".