Well, I stuck trying to Battle the wild sunbird and the game won't let me through the gate for some reason. Does anyone know if there is a certian requirement that I might be missing?
No. You are not missing anything. It is a bug that has been reported before. It happens on a few of the areas in that Arena (like Bart, and others in there).
If you "Press and Hold Down" the "forward arrow key" for about one or two minutes, it will eventually let you in. It keeps trying to push you back out, but just hold down on that key until you get in. :?