I use the action replay on my white to clone, and so I use an item duplication code to copy the feathers (makes 900).
At that point, it's just math.
If you only have 1 game, I WOULD NOT recommend using an AR on it, but if you have 2 games (or more - I'm thinking of picking up a 2nd white 2nd hand at some point in the future), and already use the cloning code - I don't see any reason why not to EV in this way. Then you get to level up w/o having to worry about EVs. :P