Well I only feel offended to the point that you gave mostly hard to mess up sets on this team so I have to get super creative to answer it.
Plus I'm tired! xD
While his moves are good, and the nature is also great, your Breloom has one key problem.
His item is at Focus Sash. This thing is going to need to hit hard fast. And while it may seem like it will still hit hard enough, when you're trying to take down things like a 252 HP / 252 Defense Hippowdon with Bullet Seed, or a 252 HP / 252 Defense Tyranitar with Mach Punch, you might need a little boost. I have two big options here.
Life orb is the first one. While it takes 10% of your HP, you're already losing like 6% if you're in sand(pretty much the most popular) or hail.
Expert Belt is the second choice. Since most of the scenarios you're hoping for are strong super effective moves, this can help tremendously without cutting bulk from you.
Politoed with physical bulk isn't too shabby when it's maxed out.
Although, a big reason Politoed carries physical bulk anymore is for those giant hippos running around setting up sand and earthquaking all over him :/
So I would say that an all out special EV spread and nature would be most beneficial. This will also be came back to in a second about building a nice core for this team to rely on using Politoed and Bronzong. ( 252 HP / 252 Sp Defense / 4 Sp Atk ) and a Calm nature for your Politoed, if you didn't get that in your head when I said full on special bulk, btw :P
Well sadly I just don't like this thing :P
And really, it has a lot to do with the fact that Ferrothorn already out classes it as a grass type for rain use ( Sporting leech seed and hazards which are most useful. Along with still getting some ever harder hitting STAB moves... ).
But that has nothing to do with why I don't think he should be in your team right now, actually. :P
To get to the point, you have a great staller in Bronzong, and Dry Skin Toxicroak is getting that rain ability recovery and the water resistance to take water moves.
What you're lacking is a solid hurricane abuser. And I think that Tornadus is best suited for this job.
[email protected] orb
EVs: 252 Sp atk / 252 Spd / 4 HP
Okay, this is just my selection of moves I like. Dark Pulse is easily replaced with HP Ice, by the way. Hurricane is STAB and abuses dat rain. U-turn milks regenerator boosts. Heat Wave gives fire coverage you need to deal with Ferrothorn, Scizor, and Forretress.
If you aren't investing EVs in your bulk, run Swords Dance.
In my experience Volt Switch is much more useful than Calm Mind. Especially with your team not having a huge rocks weakness that should be useful.
EVs should be 252 HP / 252 Defense to build a better core between him and Politoed.