Overview
With Pokemon Black and White 2 came the Therian formes and Keldeo, all of whom have bolstered the power of rain teams and worn down Tyranitar's prominence like waves against a cliff. Some older threats, such as Breloom and Mamoswine, have had new life breathed into them by their Dream World abilities. A few new Pokemon have also been added to Tyranitar's list of headaches due to their new access to Superpower (courtesy of the move tutors, who have decided not to give Tyranitar much to improve its admittedly already impressive movepool). The same Fighting-types that troubled Tyranitar before still remain in OU, ready to pounce on it at any moment. The general pace of the metagame has increased, making Tyranitar's life in OU more difficult to maintain than ever before.
However, Tyranitar maintains a powerful and respectable niche as one of two automatic sandstorm inducers, which is important due to the the ubiquity of weather in OU. While Hippowdon may give Tyranitar a substantial amount of competition for a team slot, the tyrant has many advantages up its sleeve: increased special bulk under sandstorm, a better movepool, and the ability to smite many of its would-be counters on the switch with its raw power and impressive versatility. Tyranitar's ability to support potent sweepers, such as Stoutland, Terrakion, and Sandslash, while fending off powerful specially based threats, such as Latios, Latias, Gengar, and Starmie, further expand its niche in OU. Overall, while many new threats have conspired to dethrone the tyrant, they have yet to succeed, for Tyranitar has retained an iron grasp on its throne as one of the many kings of OU.

Other Options
Tyranitar's movepool is especially impressive: It offers multiple options for boosting (from Hone Claws to Dragon Dance to Curse), a multitude of attacks, and a few support options. While Dragon Dance used to have a set of its own, the ubiquity of Technician Breloom has made it somewhat irrelevant. A mixed Dragon Dance set can be used to break stall, but it too faces the same problems a purely physical Dragon Dance set faces. TyraniBoah, a relic from the days of RSE OU, still holds some merit for stallbreaking thanks to its power and unpredictability behind a Substitute, but it is ultimately a lesser option due to the sheer force of offense reducing the usage of stall teams. Curse is still out there, but it faces the same problems the Dragon Dance sets face, is still OHKOed after a defensive boost by the myriad of Fighting-types in OU, and is more vulnerable to Trick due to Curse's Speed-reducing effects. If you desire recovery outside of Leftovers on Tyranitar, then a Rest + Sleep Talk set can be used, but it is thwarted by faster Taunt users. Roar can be used to phaze out certain targets, but Tyranitar is an inferior phazer when compared to other choices, such as Hippowdon and Skarmory. Among the support moves offered by Tyranitar, Thunder Wave stands out as a fantastic option; many Pokemon used to check Tyranitar are fast Pokemon that do not appreciate paralysis, so the move can be used to support itself and some of its slower teammates.
Checks and Counters
Naturally, Fighting-types, which resist Tyranitar's STAB moves and possess STAB on moves that target Tyranitar's largest weakness, are its best counters. Among them, Terrakion and Breloom are best suited to dealing with it thanks to the former's access to Justified and the latter's powerful Technician-boosted Mach Punch. However, Terrakion must beware of a stray Superpower, and Breloom must avoid Fire Blast or Ice Beam. Keldeo stands as a respectable counter, threatening Tyranitar with a powerful Secret Sword. Conkeldurr can use its own immense bulk to turn Tyranitar into setup fodder or force a KO on it with its powerful moves. While it must watch out for the same moves as Terrakion, Lucario is