haha seems you got your self a problem... Ok first you walk in and you com eto a split in the trees, and you wanna go Right or left. I say go right, you might run in to wild pokemon but ya gotta go through some grass in your life. Anyways go right and go up and fight a double battle then go straight until you get to a turn the you to down and fight a antoher double battle with two psychics.
After that it gets confusing because you come to a decission of 2 ways. Go straight up after passiing a large patch of grass until you can't go up anymore. Then go right until you have to stop. Then you go up all the way and mak e alittle turn and keep going up. Then make another right and you should see an exit. Hope I helped :P