Currently, I am creating multiple Secret Bases on my Emerald for EV training purposes. I currently have 14 bases and need 28 more. After that I will begin EV training my Battle Frontier team and go do that.
BTW - Mr. S, if you have more than one game, I would trade over EXP Share and give it to Ralts to help level it up faster. If you don't, make sure you get it from Mr. Stone after you deliver his letter to Steven. You really don't need Ralts before then (use Taillow on the second gym in Dewford). Good luck.