Walk on water
Well you must have dive. What you do is you go to Evergrande City and find the the underwater where you find the aqua hideout. First go in front of the door and take about four steps back. Press B repeatedly (keep pressing B)while moving forward until you look like you're going through the door. You should stop on the door and it will ask you if you want to go up from underwater. Say yes. If succesful, you will be standing on water. If you got an acro bike, you can make splashes by hopping to keep wild Pokemon away like a repel (sort of). Remember, you must stop in side the door. It works for Ruby and Emerald too.
Added by: Guest Mar 3rd 2012, ID#13665