The two Pokemon next on my list to try out are Armaldo and Cacturne.
Those are all the ones I've tried; I know there's more, too. Now, some work much better than others, but I've had reasonable success with all of those, even if some are only better strictly for their surprise factor/uncommonness.
My favourite thing about Trick Room is that 90% of the time, my opponent just doesn't know how to deal with their fast frail pokemon all of a sudden being frail AND slow (and thus pretty much useless). It's pretty easy to take advantage of this. --- PSN: Chrisuper || XBL: Irradiated Fish Steam: Irradiated Fish || 3DS FC: 2793-0592-7558