purugly is horrible. Ditto is fun, but a switch out or warp point turns you into a trapinch with 3 energy attached instead of a flygon, Fotom is a decent choice due to resistance, but due to the only +30 weakness, simply countering with weakness doesn't work. it worked pre-dp, and it works against sp, but regular guys need that extra umph. LB gets turned into 2 less cards on your deck, lucario is a wasted bench space, leaving you with 3 most of the time, 1 for lucario, 1 for your tech, 1 for the uxie you drop T2 to get out Lucario or your tech, and possibly 1 for the azelf you dropped to get lucario/tech. tech against the concept, not the weakness.
they need full benches? easy, simply slip a giant stump past the judges.