Swampert is as good a Tyranitar counter as its ever been. The Tank set 2HKOs 252/0 Tar through Leftovers almost 100% of the time while taking a pittance back. BandTar even fails to 2HKO w/ any of its moves (barring a Def drop from Crunch or a second layer). Swampert scares off Gliscor, Landorus, Heatran, ScarfChomp, Thundurus, SpD Jirachi (and Phaze out intended Wish recipients), can Phaze out SpD SD Scizor, amongst others, and can set up and re-set up SR reliably. With Ferro and Gliscor/Landorus/Garchomp being such threats, hardly anything runs HP Grass anymore, so incoming Grass attacks are easy to spot and easy to tank elsewhere on the team, especially in this metagame. Yes, Ferro causes it grief, just like Quagsire and Gastrodon, and Pert lacks Recover, but it still has clear advantages over the two (stats, Stealth Rock, and Roar). Gen. V leveled the playing field a little amongst the Water/Grounds, but Swampert still isn't dead water, not in any regard.