Hi, cool team.
It is very nice to see that Bronzong and Toxicroak, two very underrated Pokemon, are getting some use in this team. Bronzong fits a unique niche which many people don't see. It is a gift in the metagame and it is really cool to see somebody else trying it out. Toxicroak is also a pretty nice Poke on rain and partners very well with Tornadus. However you have a few problems with your team. You should really take out Hidden Power Ground for Hidden Power Grass. Hidden Power Grass is a very useful move on Specs Politoed. It can easily eliminate Gastrodon and weaken Rotom-W for Tornadus - T later n in the game. Ground offers you no real extra coverage and is redundent. Most of the things hit by HP Ground are smashed by Scald and Ice Beam. I also suggest changing Tornadus - T to a Hasty Nature instead of Lonely. Tornadus - T needs the gift of speed to be effective. And having that much is really something you should be abusing. Wasting all that speed is not really worth a slightly stronger Superpower. Hasty still gives you neutral power and gives you that speed advanatage that Lonely wouldn't. You can still eliminate Blissey this way with some prior damage. You should also change up EVs to 252 Spe / 252 SAtk / 4 Def to maximize it's speed. Like I said, Tornadus - T should be focused on speed and special attack. While Superpower is a nifty move, it does not warrant a full on offensive spread like that. You need to maximize it's ability to revenge kill fast offensive threats,many doing that will cause you to lose many games. Like my previous points you should definitely change up Tornadus - T to fit the role it plays. You could also even try Taunt over Heat Wave, which often is redundent on him in rain. Taunt cures your need for a dedicated Rapid Spinner and helps greatly against Deoxys - D teams. They don't even see it coming, meaning you can disable them early on and U - Turn right back out to regain momentum.
Thundurus - T is honestly too slow in this game to pull of a Nasty Plot set in an effective way. Even with Thunder Wave you are not reliably able to prevent from being revenged. This is why you should switch him to a Choice Scarf set so that you now gain a speedy revenge killer. Being able to revenge Salamence, Dragonite, Starmie, and Gengar gives you some clear advantages. Choice Scarf fits his profile very nicely. The string Special Attack means you will never be left with a weak move, while Volt Switch gains momentum. This is something you team will definitely appreciate more than anything else out of Thundurus - T. Changing Thunder Wave and Nasty Plot for Focus Blast and Volt Switch gives the set what it needs. Another set shift I would suggest is changing up the layout on your Toxicroak to a full fledged Swords Dance Sweeper. Using Ice Punch over Substitute and a Life Orb over Leftovers gives you an all out sweeping machine. Toxicroak is very scary for most rain offense teams today and can result in heavy damage. Ice Punch allows you to pass Gliscor and slower dragons with ease, being able to break up stall easily. This gives you a strong partner for Tornadus - T, breaking up special walls like Chansey and Blissey, while also doing it's part in killing Jirachi.
Finally, I would change up Bronzong's EV spread to one of 252 HP / 8 Def / 248 SDef Sassy 0 Spe IV to maximize it's specially defensive capabilities. Being your only dragon resist you need something to take strong Draco Meteors and Hurricanes from the likes of Tornadus - T and Latios. Bronzong can abuse this spread to the fullest in this metagame and is a great choice for your team.
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