Hmm... what if I use a Pokemon with Klutz holding an Iron Ball, and then swap with Trick?
Aha! Wait. This has Double Battle potential.
Buneary comes in with Iron Ball attached. Uses Switcheroo (breeding move) to swap items with a Pokemon holding Leftovers, King's Rock, etc. and have the other Pokemon take advantage of it. However, the only problem is that Buneary sucks.