Rate and give advice.

[Blazenoob86]

Tangrowth @ Leftovers

Ability: Regenerator

EVs: 248 HP / 212 Def / 48 SpD

Relaxed Nature

- Giga Drain

- Knock Off

- Sleep Powder

- Hidden Power [ice]

 

Mamoswine @ Life Orb

Ability: Thick Fat

EVs: 252 Atk / 4 SpD / 252 Spe

Jolly Nature

- Earthquake

- Ice Shard

- Icicle Crash

- Knock Off

 

Conkeldurr @ Assault Vest

Ability: Iron Fist

EVs: 36 HP / 244 Atk / 228 SpD

Adamant Nature

- Mach Punch

- Drain Punch

- Ice Punch

- Fire Punch

 

Tentacruel @ Black Sludge

Ability: Liquid Ooze

EVs: 248 HP / 156 Def / 8 SpA / 96 Spe

Timid Nature

IVs: 0 Atk

- Rapid Spin

- Scald

- Haze

- Toxic Spikes

 

Clefable @ Life Orb

Ability: Magic Guard

EVs: 252 HP / 252 Def / 4 SpD

Bold Nature

IVs: 0 Atk

- Moonblast

- Fire Blast

- Soft-Boiled

- Thunderbolt

 

Chansey @ Eviolite

Ability: Natural Cure

EVs: 244 HP / 252 Def / 12 SpD

Bold Nature

IVs: 0 Atk

- Seismic Toss

- Stealth Rock

- Heal Bell

- Soft-Boiled

[Idkup]

C/P'd from my teambuilding guide - some questions to answer yourself:

 

• How does this team win games?
  
• How quickly does this team expect to win games (what archetype am I playing)?
  
• How does this team provide hazard pressure and alleviate that of the opponent?
  
• Do all of my chosen Pokemon, moves, items, nature, ability, and EVs make sense in the context of my win condition?
  
• How exactly does each Pokemon contribute to the team? What synergies do they have with other members?
  
• Can I answer teams looking to overwhelm mine before I can respond?
  
• Can I answer teams looking to slowly chip mine while I fail to break through?
  

Generalizations aside, Drain Punch is banned on PRO, so you'll have to replace that. I don't really see any direction with the team - I can't tell what it's meant to do. You should know how you intend to win most of your games before you ever leave the teambuilder.