OMG! Of course this game would be cooler if they implemented, how has no one realized this yet?
Someone make this guy a CM!
Hell, fire Kyu and give this guy his job, he clearly knows a lot about game design!
release all your pokemon and log off. When you log in they'll be back in your PC, and they'll have the EVs you want.
Just make sure you wish really hard before logging off (but after releasing)