Yeah, thanks for the tip, but I already knew that!
Also, I guess I should add, if you want to EV (effort point) train a lot of pokemon at once (say you need speed EV's for all the pokemon in your party, fight in Diglett's Cave) just attach Exp. Share to every pokemon except the first one, and attach Macho Brace to the first pokemon in your team, you will have really quick EV training!