i don't know why we're mentioning garbage like jolteon and zapdos vs tornadus. the whole point of tornadus's bullshit is that most of its switch-ins don't have proper healing as they just switch right back to ferrothorn to take your damage and heal their tornadus for more than your sr can hurt them. spikes ferrothorn + tornadus-t literally handles jirachi rotom-w jolteon etc.
i called zapdos garbage because it is pretty much but i will say it at least has roost (and jirachi at least has wish making it the best counter by far) although its hindered by a weakness to sr (it'll roost as ferro comes in for free and spike). but that doesn't change the fact that tornadus's regenerator + a spikes leech seed ferrothorn is really way too good in ou at the moment because of tornadus's amazing speed, amazing move, etc.
ninetales is a good check i guess but the problem is sr/spikes weak, no healing, and politoed is a trio of things. i guess we can play the i counter you you counter me game all day though and say ninetales has a spinner but the rain team has a jellicent but the ninetales has a cb weavile as insurance etc etc. thats just dancing around the fact that tornadus as it stands has an incredible stab attack, an incredible ability that lets it just spam attacks, AND, can easily be using an acrobatics/superpower/taunt/u-turn set, or even life orb hurricane + u-turn into counters.
im actually kind of annoyed because this reminds me so much of skymin last gen where we list counters and checks (funny how most of their counters and checks are basically the same) and yet i think we all pretty much knew how busted skymin was. tornadus-t is the exact same thing except it just handles the power and incredible speed part, and becomes a perfect teammate and abuser of the leech seed + spikes part (hell not even skymin got the luxury of spikes). i usually dislike comparing stuff but its appropriate to think practically here and not just a game of "this checks that and this counters that"
also i made a template on how to build a winning team on PS
:P no but seriously, this is ridiculous i swear this is the structure of basically every team i play at this point ;_; even i started using it