I've heard the best thing to do is have a Wobbuffet with Shadow Tag in your party. I just wanted to make sure this the most efficient thing to do and make sure there's no held item or anything that prevents wild Pokemon from fleeing or something like that. Thanks. :)
This calls for science! http://i281.photobucket.com/albums/kk219/ManuFlops/dsscsdc.jpg
You could breed Hypnosis on a Mr. Mime with Soundproof. Once you pass Mean Look to him he can keep them from fleeing, won't be affected by Roar, and can put them back to sleep when they wake up, making caputring them much easier.
It would appear that I have been driven to madness. Probably would have been faster to walk.