The most useful thing you can get for EV training is a Pokemon with Pokerus, since it doubles the EVs received. You can easily get one from another Smogon member if you can get on WiFi. You only need to do it once, since the Pokerus is easily spread around.
As the guide linked to in your thread mentions, Pokerus and Power items together make your EV training ten times as fast. I did it the slow way back in Emerald, and I can assure you the speed boost will be very worth it.
As the guide linked to in your thread mentions, Pokerus and Power items together make your EV training ten times as fast. I did it the slow way back in Emerald, and I can assure you the speed boost will be very worth it.