Pokémon Emerald Glitches

Surfing out of bounds
This glitch is similar to the "Walking on Water" glitch, but is different. To do it, you need to go to the Marine Cave entrance on Route 129, and, as described in the other glitch, mash the B button while walking through the entrance. This will take many attempts, but you will end up standing on the entrance if done correctly. When you re-surface, you will be surfing in an area that would normally be inaccessible through normal methods. An invisible wall prevents you from leaving the route and crashing the game, however. Flying anywhere will correct the glitch.