I've used a bit of Trick Room recently, for kicks, but it's really quite cool.
Passho Claydol works really well, and is namely to stop Rain Dance teams, by Trick Rooming to make their Swift Swim boosts work against them. It can then Explode obviously too, so it's pretty good.
But more to the point of this post, Shelgon is really awesome. Before you all scream Gabite, Shelgon has higher Attack, but more importantly for me, 39% better Defense when both use 252 HP / 0 Def. Shelgon is better under Trick Room. Not having Earthquake is a bummer, but I doubt actually use it much if I had the choice, as it would be much easier to stall out my valuable Trick Room if I was locked into EQ as opposed to Outrage...still lame though.
For the doubters, I've conjured up some damage calculations.
CB Outrage to 252 HP / 252 Def Weezing: 49.40% - 58.38%
CB Outrage to 252 HP / 252 Def Spiritomb: 58.55% - 69.08%
CB Outrage to 4 HP / 0 Def Shaymin: 64.11% - 75.74%
CB Outrage to 4 HP / 0 Def Blaziken: 115.23% - 136.09%
CB Outrage to 252 HP / 0 Def Mismagius: 120.68% - 142.59%
CB Outrage to 4 HP / 0 Def Hitmonlee: 178.51% - 209.92% (lol)
You can see it's pretty strong...I know others have used this (namely LightWolf who also had pretty good results with Shelgon), and others such as Kevin Garrett have seen this work pretty well. It was especially nice as Azumarill with CB Aqua Jet was previously running over my team, but it only manages 17.96% - 21.26% to Shelgon now, which is awesome.
Foresight Hitmontop seems to be all over the place, too.