cheating-is-good

Best answer as chosen by Asker / Ratings
Alright, I cannot remember exactly what to do so don't quote me on this, but I think that I remember enough to help you. In order to get the EXP.share, you first need to have one badge so that the old man who lives near Petalburg City can take you to places like Dewford Town, and Slateport City. So, first you need to head to Rustboro City and defeat Roxanne. After you do that, complete all the events there by helping the researcher who works for the Devon Corporation. After you do that, you will be lead to the Devon Company building. Head up the stairs to meet the Leader, Mr.Stone. Now, he will give you a letter that you need to deliver to a man named Steven. Go to Dewford Town, and go inside Granite Cave. Explore the cave until you see Steven, and give him the letter. Now, return to Rustboro City and speak with Mr.Stone, he will give you the EXP.share.

Hope this helps.