Turtle team

Question

So a friend of mine liked the idea of a ''turtle team'' and we came up with these six Pokémon.
It's for online battling in US&UM. What do you guys think? I honestly really like this team :D

Torkoal (Fire) – Psychical Attacker / Hazard Remover
• Ability: White Smoke
• Brave Nature (+Atk, -Spe)
• EVs: 252 HP / 252 Atk / 4 SDef
• Item: Leftovers
• Moves: Curse / Body Slam / Gyro Ball / Rapid Spin

Carracosta (Water/Rock) – Physical Attacker
• Ability: Solid Rock
• Adamant Nature (+Atk, -SAtk)
• EVs: 252 HP / 252 Atk / 4 SDef
• Item: Leftovers
• Moves: Curse / Liquidation / Stone Edge / Earthquake

Shuckle (Bug/Rock) – Defensive Wall
• Ability: Contrary
• Bold Nature (+Def, -Atk) / Impish Nature (+Def, -SAtk)
• EVs: 252 HP / 128 Def / 128 SDef
• Item: Leftovers
• Moves: Toxic / Shell Smash / Power Split / Rest

Turtonator (Fire/Dragon) – Special Attacker
• Ability: Shell Armor
• Modest Nature (+SAtk, -Atk)
• EVs: 252 HP / 252 SAtk / 4 SDef
• Item: Rocky Helmet
• Moves: Taunt / Flash Cannon / Dragon Pulse / Flamethrower

Torterra (Grass/Ground) – Physical Attacker
• Ability: Shell Armor
• Adamant Nature (+Atk, -SAtk)
• EVs: 252 Atk / 252 Def / 4 Sdef
• Item: Life Orb
• Moves: Curse / Stone Edge / Seed Bomb / Earthquake

Mega Blastoise (Water) – Special Attacker
• Ability: Mega Launcher
• Modest Nature (+SAtk, -Atk)
• EVs: 252 HP / 124 Def / 4 SAtk / 128 SDef
• Item: Blastoisinite
• Moves: Aqua Ring / Aura Sphere / Dark Pulse / Surf

Comments

What Format? What Items?

I think Rock Polish is a bit more Useful on Torterra with correct setup.

Turtonator is unviable without Shell Smash, so you should Probably give it that move.

Aqua Ring Should be replaced with an attacking move on Blastoise; Blastoise is usually a better Rapid Spinner than Torkoal. :P
Shell Smash Shuckle isn't Great when haze and Toxic Exist; if you rely on Curse less on some of your Turtles, Sticky Web can be a very effective way to outspeed and KO more Pokémon, as all of your Pokémon have many weaknesses and are therefore less Viable with Curse. :P
Therefore, Shuckle should do Better with Rest, Toxic, Sticky Web, and Wrap/Infestation/Sand Tomb. :P

Just some suggestions. You don't have to follow them. :P

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I think Shell Smash is a great move for Shuckle: because of Contrary its attack and special attack decreases even more so Power Split will make the opponent piss its pants :P

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the shuckle should be a lead set with stealth rock and sticky webs

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Haze removes those boosts and Toxic easily kills Shuckle. If Shuckle uses Rest, they can switch out, Set up 2 Swords Dances/Tail Glows, and OHKO Shuckle. They can also use Taunt to force Shuckle to use Struggle and die. Also, a lot of Water types OHKO Shuckle anyways, due to Shuckle's poor Base HP. Chansey won't care about anything Shuckle does because it can Heal status, use Seismic Toss, and Heal. Shuckle without Sturdy and Sticky Web is not worth using, unless you fight in the Battle Tree, against scrubs who don't know what they are doing, or if you plan on losing. Shell Smash Shuckle is only good against Game AI or inexperienced players. :P

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This is the best idea for a team. Ever.