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Claydol
Your EV spread is kind of messed up, and I want to start by saying a full adamant nature'd Claydol with only Explosion as a move is not a good idea. Change those EV's to a more defensive spread, something along the lines of: 252 HP / 252 SpD / 4 Atk <- A specially defensive set. (Or a defensive set if you prefer)
I won't really see something wrong with the moves, but use EQ over Explosion. EQ can hit Chandelure, which won't be doing much to a maxed out SpD Claydol, and Raikou, which won't be doing much either. EQ can also break their subs, given taht they use a CM set and not something else.
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Hitmontop 
Ok, the item is not what it should be. Life Orb means that you will take extra damage, especially on a Pokemon that I would rather be a defensive spinning set. Life Orb racks up the Rapid Spin damage, plus the hazards because if you are here it's probably to spin away hazards. Go with leftovers, and a set like this: Toxic, Mach Punch (Technician)/Close Combat (Intimidate) Triple Kick (To break subs, ok, reasonable). And change those Atk EV's to HP. (A little bit of Attack won't hurt, though)
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Slowbro 
Setting up Rain? Not a good idea. Why? A player can easily see the Kingdra, and once you set up Rain it's way to obvious you are going to switch to Kingdra. You also lack recovery. Slack Off would be a great way to counter this, along with Thunder Wave to screw sweepers. EV's are also messed up, Slowbro is a great counter to Defensive Pokemon, not Special Defensive ones. 252 HP / 200 Def / 56 SpA is great. Or because you lack a good specially attacking Pokemon, I would suggest a Specs set.
Slowbro @ Choice Specs
Trait: Regenerator
EVs: 252 HP / 252 SpA / 4 Def
Modest Nature
- Psyshock
- Scald
- Ice Beam
- Trick/Hidden Power of your choice
This means you can hit hard and surprisingly, most people will not suspect a Specs set.
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Kingdra 
Band? Well now that I have taken out Slowbro's ability to set up Rain, Kingdra has to do it. A Life Orb set in the Rain would be a great set, because not only does it's speed get doubled, outspeeding everything except the fastest Pokemon in the tier scarfed, Kingdra is a monster. A set like Outrage, Waterfall, Dragon Dance (Perfect set up time when you force an opponent out) and Rest. Speaking of Rest, RestChesto is ok too, but because a cleric (Roserade) has Aromaterapy, I would go with LO.
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Confagrigus 
You have no counter to ghost type moves. None. And that's problem because Nasty Plot Mismagius owns you. Because of this, I suggest a Dark type Pokemon. Here are some great counters to ghoties:
Cobalion @ Choice Scarf
Trait: Justified
EVs: 4 SpA / 252 Atk / 252 Spe
Naive Nature
- Close Combat
- Iron Head
- Volt Switch
- Zen Headbutt/X-Scizzor
Houndoom @ Life Orb
Trait: Flash Fire
EVs: 252 SpA / 4 Atk / 252 Spe
Hasty Nature
- Dark Pulse
- Fire Blast/Flamethrower
- Sucker Punch
- Hidden Power [Ice]/Any Hidden Power
Others include:
Sharpedo
Scrafty
Krookodile
Honchkrow
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Roserade 
First of all, change the item to Black Sludge. I would also put Aromatherapy on there, to act as a cleric. Replace Toxic Spikes. Also, make the EV spread something along the lines of: 252 HP / 200 SpD / 56 SpA. Oh, and use Giga Drain> Leaf Storm. Other than that, this is great!
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Good luck with the team, and most importantly have fun with it!
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