The #1 threat in the current metagame, Choice Specs Tornadus-T, could very easily do an extreme amount of damage to your team. You don't have a Flying resist, which really hurts you, since Hurricane 2HKOes pretty much anything that doesn't resist it. Sure, you can revenge it using Terrakion, but it is very easy to know that the opponent is using a Choice Scarf set if it comes right after it KOed something, because Terrakion is normally OHKOed by Hurricane. Since it doesn't mind Entry Hazards, it won't hesitate to switch out in fear of losing 25% of its HP the next time it comes in. You can also stall Hurricane's PP using Vaporeon, but it is 2HKOed, so you can't switch in at all. You can't change the weather since you're running Rain yourself, meaning it is more than likely that it sweeps you. To be fair, lacking a Dragon resist is kinda suicidal in BW2 too, with all the powerful Draco Meteors running around, because they can beat you a bit in the same way as Tornadus-T, opening holes eveytime they come in. Swapping Vaporeon for a Specially Defensive Jirachi might be an excellent idea, since it can tank Hurricanes easily, while also taking Draco Meteors etc. Vaporeon and Jirachi are two extremely sturdy Pokemon and I think it's the most redundant one, so you won't lose much here except a Water resist, and even then, a lot of Water types run Electric coverage nowadays.
If you want to maximize Tornadus-T's potential at destroying teams with Hurricane, you should probably change its held item to Choice Specs. You said that Life Orb is detrimental to Tornadus-T's goal of not minding Entry Hazards, so you opted for Sharp Beak. The power difference between Sharp Beak and Choice Specs is very great and it allows you to secure more KOs, such as Terrakion, which is NEVER OHKOed by Sharp Beak while Choice Specs though, will always OHKO after Stealth Rock. There is no big detriment of using Choice Specs other than not being able to blast Tyranitar with Superpower after it came in to sponge Hurricane, still, Hurricane has such great coverage that it is the only situation that will hurt you. You could change Superpower for Focus Blast to take full advantage of Choice Specs then, however, it has shaky accuracy and Superpower still hurts Tyranitar a lot.
I really like Landorus-T on this team as I feel it is what makes its defensive synergy so solid, however, I think you could really support it better. Landorus-T has an incredible Attack stat, but it is slow, so paralysis support really helps it. Along with Jirachi who spreads it well if you take my suggestion, you could use Stun Spore instead of Hidden Power Ice on Ammoonguss. While you Spore their sleep absorber, which will usually switch out after, you can use Stun Spore which really cripples their switch-in. It's a very effective strategy as it allows Amoonguss to severly handicap two of their team members while it can't do much more really. A paralyzed team is a really easy prey for Landorus-T.
Finally, Politoed has a great moveset, but I don't think Hidden Power Grass is the best move it could have. Toxic really cripples bulky Water types like Gastrodon as it makes it much more difficult for it to wall stuff, and without investment you won't even OHKO it anyway. Perish Song is actually a very good move for Politoed because it allows it to phaze out dangerous threats, put an end to Baton Pass chains, and put you in a winning condition against your opponent's last pokemon, as long as you can last 3 turns (and Politoed isn't your last Pokemon).
Here's the set you should use:
EVs: 252 HP / 4 Def / 252 SpD