Rate My OU Team Please

Question

Cloyster @ White Herb
Trait: Skill Link
EVs: 252 Def / 252 Atk / 4 Spd
Impish Nature
- Shell Smash
- Rock Blast
- Icicle Spear
- Ice Shard

Gengar @ Life Orb
Trait: Levitate
EVs: 252 Spd / 252 SAtk / 4 HP
Timid Nature
- Thunderbolt
- Shadow Ball
- Sludge Bomb
- Focus Blast

Landorus-Therian (M) @ Expert Belt
Trait: Intimidate
EVs: 252 Atk / 252 HP / 4 Spd
Adamant Nature
- U-turn
- Earthquake
- Stone Edge
- Superpower

Scizor @ Choice Band
Trait: Technician
EVs: 252 Atk / 252 Spd
Lonely Nature
- Pursuit
- Bullet Punch
- U-turn
- Superpower

Volcarona @ Life Orb
Trait: Flame Body
EVs: 252 SAtk / 252 Spd / 4 HP
Serious Nature
- Fiery Dance
- Bug Buzz
- Giga Drain
- Hidden Power [Water]

Breloom @ Toxic Orb
Trait: Poison Heal
EVs: 252 Atk / 252 HP / 4 SDef
Adamant Nature
- Drain Punch
- Spore
- Seed Bomb
- Mach Punch

Comments

The Cloyster set doesn't really work for it. You're mixing its two roles together and it just makes it less effective. Either put on Shell Smash and go all out sweeping or give it Rapid Spin and maybe Spikes and give it that Entry Setter role.
Breloom should be using Focus Punch so it can have some power behind it. Without Swords Dance and/or Technician, Mach Punch isn't going to net you the KOs you want.
Bug Gem is a pretty bad item. Go Band or Expert Belt (for faking a Band).
Also a bad item is Shell Bell. Leftovers is better even on something like a sweeper, as it is far more reliable healing. And give the thing Roost and/or Swords Dance. Otherwise give it a Band since this guy is an all out offensive set.
Give Gengar Trick.

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wouldn't shell smash with white herb work on cloyster?