I don't know if this set, or something similar, has been posted before, but I've been trying it out on a new Shoddy team and it has been working rather well (it's won me several matches when it's been my last Pokemon). I didn't see a specific set on the analysis either.
EDIT: I have rewritten it now to look better
CMZong
Bronzong @ Leftovers
Levitate
Relaxed/Bold (since 0 Spd is not needed)
252HP/58Def/100SpAtk/100SpDef
(The EVs are a little odd because I'm not very good at EV spreads)
Hypnosis
Calm Mind
Psychic/Hidden Power/Shadow Ball
Grass Knot/Hidden Power (see section below for types)/Charge Beam/Shadow Ball
This is best brought out late in the game when the opponent has fewer Pokemon left to switch in. I usually bring this in either on a weak special attacker or a weak wall, Hypnotize them and CM up (twice generally). Psychic is the better STAB option and after a couple of Calm Minds is very powerful. The tough part is choosing the final slot, so I'll split this into two parts - Hidden Powers and other moves.
Grass Knot is useful for Tyranitar, Milotic, Dugtrio and general coverage. I use this at the moment but I'm finding more and more Pokemon I get walled by. Weavile in particular is a major threat, Metagross (especially if AgiliGross sees an opportunity to set up), Magnezone and Celebi like me too. Shadow Ball covers some of these threats but leaves you completely open to T-tar. Charge Beam is there for the Electric coverage (and if you forego STAB you can get pseudo-BoltBeam) but is a weaker option than most of the other options.
Hidden Power Types
There are lots of these that can be used, so I'll explain the advantages and disadvantages of each.
Electric:Covers Gyarados mainly. A slightly more powerful version of Charge Beam without the SpAtk boost.
Fire: Leaves you wide open to Heatran and T-tar but covers Magnezone, Celebi, Metagross, Forretress and Weavile as well as other Bronzong. The best option
Ground: Helps cover Heatran, Metagross and Magnezone, but leaves you wide open to Celebi (among others)
Ice: 4x Dragons, nothing resisting it 4x plus an extremely weak pseudo-BoltBeam if you run Charge Beam (remember this means no STAB move).
Fighting: Steel-types, Blissey/Snorlax and T-Tar, but this leaves you wide open to Celebi. Also, if you run this with Shadow Ball Ghost/Fighting is a good move combo, which hits lots (if not all) Pokemon for at least neutral. But you will have to forego STAB or Hypnosis, which is not recommended.
Dark: If you get 31/31/31/31/31 IVs, you get this HP type, which hits other Psychics at the cost of T-Tar or Heatran coverage.
I have three Shoddy logs since this was initially posted in which CMZong has killed 3 or more Pokemon. :)