Here's one that has just been working STUPIDLY well for me, however, this would just be for a one move update to an analysis that already exists. Please note that I am NOT saying my variant is better, but I AM saying that my variant is competitivly viable for todays metagame.
Trick + Iron Ball (Update)
Item: Iron Ball
Ability: Clear Body
Nature: Adamat
EVs: 236 HP/252 Atk/20 Speed
Moveset:
-Trick
-Meteor Mash
-Earthquake
-Explosion/Stealth Rock/
Body Slam
The idea here is to add some utility to this set. As oppossed to having a one time use (usually) moveslot using either Explosion or Stealth Rock, how about if after that Tricked Iron Ball (since with my expierence, the opponent will more times than not switch out), you try and cripple yet another Pokemon via the 30% paralysis rate from Body Slam (suppossing a Ghost tyoe wasn't switched in). Even if a ghost type does make the switch in, you didn't just Exlopde like the old set warns you about. If you can also supply Wish support (most likely from Vaporeon or Umbreon), this variant can come back in for some more fun later instead of having wasted itself (via Explosion). Wash, rinse, repeat with the hard hitting (potential) paralysis support.
At 30%, paralysis support via Body Slam is not always going to happen, but on a switch in (only taking into consideration the 48 OU legal Pokemon), you have MORE of a chance of hitting for any damage over Earthquake (There are 7 Ghost types which Body Slam won't hit, paired against 17 Flying/Levitate Pokemon that Earthquake won't hit, and 7 non-flying, non-Levitating Steel and/or Rock types that aren't very likely to switch in). With Explosion, you don't get a second chance (as stated in the above paragraph), and with Meteor Mash, Metagross' common counters (save for Swampert), will be more benificial being paralized, as oppossed to getting hit with Meteor Mash, since it's not too likely any Steel type not named Bronzong, and no Rock types will be switching into Metagross for any reason.