Okay, so with access to Politoed running a Rain Dance team is really ouctlassed.
I also notice that you only have 1 OU pokemon, which is not bad, but is isn't great.
Bronzong - Looks good but replace Damp Rock for Leftovers and replace Rain Dance for Toxic. I would also suggest running zero IVs in speed to ensure that Gyro Ball hits with maximum power.
Empoleon - No. Run a Swords Dance set instead.
Empoleon @ Leftovers
EVs: 4 HP, 252 Atk, 252 Spd
- Swords Dance
- Aqua Jet
- Drill Peck
Swords Dance gets your attack up to dangerously high levels, Aqua Jet is STAB and priority, don't underestimate it's base power, it hits hard at +2 in the rain. Drill Peck and Earthquake are coverage.
Tornadus - I assume you mean Therian form, but besides that is beside the point because I am going to suggest you use Thundurus-T anyway. Thundurus-T will make a nice Volt-turn core with Meinshao and will also help to absorb Electric moves, which somewhat plague the team.
Thundurus-T @ Choice Scarf / Choice Specs
Trait: Volt Absorb
EVs: 252 SAtk, 4 SDef, 252 Spd
Modest Nature / Timid nature
- Volt Switch
- Focus Blast
- Hidden Power Water
Choice Scarf if you want speed, and Choice Specs if you want to mow down enemy teams at the cost of being easily revenged. Go with Modest if you run Scarf and Timid if you opted for the destruction of the Specs. Volt Switch is good for revenge killing and Thunder is STAB. Focus Blast and HP Water provide good coverage.
Meinshao - Looks good but replace Wide Lens for Life Orb, and consider Stone Edge over Rock Slide.
Accelgor - Instead of correcting your set I am just going to give you a set that I have grown to become quite fond of.
Accelgor @ Choice Specs
Trait: Sticky Hold
EVs: 252 SAtk, 252 Spd, 4 Spdef
Bug Buzz is STAB, HP Ice is good coverage, Focus Blast hits Rock types, and Giga Drain is additional coverage.
Kingdra - Goodbye Kingdra, hello Politoed!
Politoed @ Leftovers
EVs: 252 HP, 252 Def, 4 SAtk
- Perish Song
Standarf physically defensive Politoed.