Jar Jar, I found that using shell bell is a great sweeping item. If you raise his attack to maximum, he is guaranteed to kill a Pokemon that takes neutral damage from it (since ghost has very few resistances), and thus healing it greater then leftovers could ever dream of achieving. Of course, if you're running a defencive set (like the one suggested by Fizz), then leftovers would shine for his moveset. But in my opinion, Shell Bell would suit my moveset more so than Leftovers. Yes, I understand that Shell Bell can't heal me during the setting up stage, but like I mentioned before, it is more suited to the sweeping stage, which is what my moveset is all about - sweeping.
Shell Bell may not be the most effective item, I understand that, and that's why I also suggested Life Orb - to also aid in sweeping.