And so what of it? Tyranitar makes excellent use of Sand Stream himself. Careful Tar isn't even 2HKO'd by Latios' Draco Meteor (one of the strongest moves in OU), and can threaten back with Pursuit. Surfs can't OHKO him, heck unSTAB'd ones won't even 2HKO (Lati Specs Surf < Specs DM). He can Dragon Dance (though this is a little hard), he can pick off weakened targets with Pursuit, he can also lay hazards. Stop saying SS is the only thing Tar is good at, 'cause that's bullshit. Hippowdon is a decent physical wall, but he has middling SpD and gets really hurt by things like Surf and Grass Knot, has a shallow movepool, and has nothing close to Tyranitar's utility. Banded Tar and Mixed Tar can tear holes into teams, ScarfTar can outrun a lot of things (+115s, iirc), DDTar can surprise once his checks are gone. Tell me how many sets you can run with Hippowdon, how many teams you can fit him on. Stop fucking overestimating his weaknesses and look at his sheer utility, and you'll see why people use him. No, not just to provide sand.Fighting types eating Tyranitar alive is just one of the many reasons.
It has a horrid defensive typing, it has abysmal speed (even after DD it fails to outspeed many threats), it has no priority moves while being 4x weak to Mach Punch and Vacuum Wave, its other ability is near useless, its Sp. Atk. stat is mediocre by Gen 5 standards and as icing on the cake its strongest attack (Stone Edge) has imperfect accuracy which could cost you the game.
Ask yourself this: why do you use Tyranitar? Because you need a tank? No. Because you need a sweeper? No. Because you need a wallbreaker? Possible, but many other pokemon do that better.
The correct answer is: because you need Sand Stream.
There is simply no reason to use Tyranitar without SS so don't be surprised if it falls to BL.
Heck it could even be UU as long as Evolite Chansey stays there.
@Raikaria: TTar without SS is a different monster but really, what I was addressing is between Hippowdon and Tar. As long as he can use Sand Stream he is NOT outclassed by Hippowdon. That's it.