I'm seeing that a lot of people are saying that Tornadus-T doesn't have counters outside of SDef Jirachi and SDef Rotom-W. This is not true at all. Let's take a look at Tornadus-T counters:
SUN - Yeah. Sun. You *can* use Rain Dance but it sucks with Specs. And Rain Dance wears off in just 5 turns. And Ninetales can Sunny Day as Tornadus-T Rain Dances. In rqin, Hurricane is 50% accurate. That's super unreliable and makes it impossible for Tornadus-T to get much done. U-turn / Focus Blast or Superpower just isn't cutting it. Sun neuters it to a point where you shouldn't be threatened. With Hurricane so unreliable, stuff like Scarf / TR Victini and Volcarona can do as they please. And if Tornadus-T is weakened enough, Venusaur can revenge kill with Sludge Bomb / HP Ice.
SAND - All it does is cripple Hurricane, but that in itself basically destroys Tornadus-T. Oh and SDef Hippowdon can take any hit.
CHANSEY - Even Superpower can be stalled out with Softboiled (it can take two) and then Chansey can get up rocks to pretty much negate Regenerator, Toxic to wear it down, and / or Seismic Toss to wear it down quickly. Now, Chansey can't fit on every team, but it's a good counter. Blissey dies to Superpowers but otherwise it does well.
SDEF SKARMORY - It can take 2 Hurricanes and isn't even guaranteed to be 2HKOed with the inaccurate Focus Blast. In return it can Brave Bird for some damage, set up some free Spikes, or phaze it out with Whirlwind. Straightforward.
METAGROSS - Tell me it sucks idc- standard 252/160 Metagross can take 2 Focus Blasts or Hurricanes and go for a Hammer Arm (to slow it down) followed by a Meteor Mash for the KO after some prior damage. Guess where you get that prior damage. Oh, Stealth Rock!
That's just OU Pokemon. Let's see Pokemon from lower tiers:
BRONZONG - It can take every hit Tornadus-T has at its disposal so long as it has a bunch of SDef investment. It can hit back hard with Gyro Ball and HP Ice or set up Stealth Rock to mess up Regenerator.
Only one there but you get the idea. Countering Tornadus-T isn't hard, and it has plenty of checks e.g. Pokemon that can switch into Hurricane. Pocket said everything else there is to say. Tornadus-T isn't broken, really. Keldeo, the other suspect, is nowhere near broken imo.
There are some flaws with these counters. Changing the weather permanently requires team commitment. Chansey and Skarmory are shut down by Taunt, and risk being outlasted. Bronzong and Metagross have no reliable recovery moves, so they risk being outlasted as well.