You can also gain EVs faster on the Hammerlocke university jobs by giving your pokemon a power item as a held item (e.g., the power anklet, power band, power belt, power bracer, power lens, and the power weight). You can obtain them at the central Hammerlocke Pokemon Center for 10 BP each. They allow you to max out the EVs of a pokemon's stat in 24 hours, which is really handy if you don't have much BP to buy vitamins.