At the risk of being odd-
Timid Compound eyes 252 sp att /252 speed no item
Thunder...well, obviously too good to pass up. Bug Buzz, the same. Thief is for the pokemon who are sooo relying on an item. Volt Switch is to leave if none of the above apply.
I know this is for battling, but the in-game application of this set is phenomenal also.
Robbing the wee beasties nets a lot of useful berries, mental herbs, et al.