So my friend invited me to a tournament this Sunday.

Rules are the standard smogon rules and clauses except Only one OU Pokemon is allowed per team.
 I need help to prep, here's the current team lineup.
Any thoughts?

Volcarona @ Air Balloon\
Ability: Flame Body\
EVs: 4 HP / 252 SpA / 252 Spe\
Timid Nature\
- Bug Buzz\
- Giga Drain\
- Fiery Dance\
- Quiver Dance\
\
Donphan @ Leftovers\
Ability: Sturdy\
EVs: 252 HP / 4 Atk / 252 Def\
- Rapid Spin\
- Stealth Rock\
- Ice Shard\
- Earthquake\
\
Togekiss @ King's Rock\
Ability: Serene Grace\
EVs: 156 HP / 212 SpD / 140 Spe\
Calm Nature\
- Thunder Wave\
- Air Slash\
- Roost\
- Heal Bell\
\
Kyurem-Black @ Power Herb\
Ability: Teravolt\
EVs: 4 HP / 252 Atk / 252 Spe\
Jolly Nature\
- Fusion Bolt\
- Shadow Claw\
- Dragon Claw\
- Freeze Shock\
\
Quagsire @ Leftovers\
Ability: Unaware\
EVs: 4 HP / 252 Atk / 252 Spe\
Bold Nature\
- Toxic\
- Scald\
- Protect\
- Recover\
\
Metagross @ Leftovers\
Ability: Clear Body\
EVs: 252 HP / 4 Atk / 252 Def\
- Bullet Punch\
- Earthquake\
- Power-Up Punch\
- Protect\
\
}

I'm fairy certain kings rock only works on moves that don't already have a chance to flinch but I could be wrong

I'm fairy certain kings rock only works on moves that don't already have a chance to flinch but I could be wrong

No it does increase the flinch chance of already flinching moves. Because of kings Rick and serene grace the flinch chance is something like 70%

First of all, King's Rock does not affect moves that already have a chance to flinch. Give your Togekiss Leftovers instead since it's a defensive set.
Source: http://bulbapedia.bulbagarden.net/wiki/Evolution-inducing_held_item#King.27s_Rock

Also, Air Balloon on Volcarona doesn't do much. You're much better off using Life Orb or Leftovers since a glass cannon needs all the help it can get. Quagsire switches in well on Earthquakes, so an Air Balloon is definitely not needed.

Quagsire's nature should be changed to Relaxed so that your Attack and SpA isn't weakened (Bold reduces the Attack stat meaning your Earthquakes will be doing less damage). EVs should be 252 Def rather than Att to maximize its bulkiness, it has a rather mediocre Attack and awful Speed stat so an offensive one won't get you anywhere. Quagsire's role has always been better suited to a tank anyway.

Kyurem-B's arguably best set is the mixed attacker, but if you want to run a physical attacker, I won't stop you.

I'm not sure if your Metagross is your Mega Evolution, but I sure hope it is. Make sure it's Jolly to outspeed threats such as Excadrill and Choice Scarf Tyranitar. I would also replace Protect with either Meteor Mash to potentially increase your Attack and for extra STAB, or Ice Punch to deal with Gliscor and Landorus-T. Thunder Punch also works to deal with Skarmory.



Good luck to you.

First of all, King's Rock does not affect moves that already have a chance to flinch. Give your Togekiss Leftovers instead since it's a defensive set.
Source: http://bulbapedia.bulbagarden.net/wiki/Evolution-inducing_held_item#King.27s_Rock

Also, Air Balloon on Volcarona doesn't do much. You're much better off using Life Orb or Leftovers since a glass cannon needs all the help it can get. Quagsire switches in well on Earthquakes, so an Air Balloon is definitely not needed.

Quagsire's nature should be changed to Relaxed so that your Attack and SpA isn't weakened (Bold reduces the Attack stat meaning your Earthquakes will be doing less damage). EVs should be 252 Def rather than Att to maximize its bulkiness, it has a rather mediocre Attack and awful Speed stat so an offensive one won't get you anywhere. Quagsire's role has always been better suited to a tank anyway.

Kyurem-B's arguably best set is the mixed attacker, but if you want to run a physical attacker, I won't stop you.

I'm not sure if your Metagross is your Mega Evolution, but I sure hope it is. Make sure it's Jolly to outspeed threats such as Excadrill and Choice Scarf Tyranitar. I would also replace Protect with either Meteor Mash to potentially increase your Attack and for extra STAB, or Ice Punch to deal with Gliscor and Landorus-T. Thunder Punch also works to deal with Skarmory.



Good luck to you.

Metagros is defensive but I'm replacing him with a specialty defensive Jirachi
Quagmire isn't using earthquake, just scald and toxic.

This might seem like weird advice

If I were you I'd replace Power Up Punch with either Flash Cannon or an Ice Punch

In my experience, coverage moves determine the tides of battle, and Ice Punch with Metacross saved me a few times

I've actually replaced metagross altogether in favor of mega venusaur