Offensive CM: Ghostceus, Fightceus, Electriceus
Defensive: Steelceus, Grassceus, Waterceus, Rockceus (in SS)
I've experimented with CM Ghostceus, and the Support set (last in the analysis) is my favorite and is excellent for countering EK Arceus and CM sweeping too.
Currently, I'm loving Fightceus (you should use this one it's REALLY cool), as there aren't very many sturdy Fighting types in Ubers and this one REALLy cleans up mid-late game, and is good for tanking and stalling out Draco Meteors, weaker moves, etc. and then setting up and sweeping (Just watch out for Ho-oh, Lugia, and Mewtwo) If you want to, try the Calm Mind set in the analysis.
Steelceus is one of the few viable Steel types in a metagame where Dragon moves are rampant, and Grassceus/Waterceus are good checks for ScarfOgre (but I still love my LO Palkia). Haven't used Electriceus, but BoltBeam coverage is pretty decent in Ubers and Rockceus is a pretty good tank in Sandstorm as well as a Ho-oh check. Obviously, the big one everyone needs to watch out for is EK Arceus, so make sure you have a GOOD check on your team! :)
Hope this helped!
VM or PM me for Ubers RMT rates!
Also, I can make amateur checks for analyses!