I am new to competitive, and wanted to make a good, well rounded team to do battling with, and this is my current team

Mawile @ Mawilite
Ability: Intimidate
EVs: 252 Atk / 252 HP / 4 SDef
Adamant Nature
- Iron Head
- Sucker Punch
- Play Rough
- Substitute

Azumarill @ Life Orb
Ability: Huge Power
EVs: 252 Atk / 252 HP / 4 Def
Adamant Nature
- Aqua Jet
- Play Rough
- Waterfall
- Belly Drum

Salamence @ Life Orb
Ability: Intimidate
EVs: 252 Spd / 252 Atk / 4 SAtk
Naive Nature
- Dragon Claw
- Dragon Dance
- Earthquake
- Fire Blast

Aegislash @ Rocky Helmet
Ability: Stance Change
EVs: 252 Atk / 252 HP / 4 SDef
Brave Nature
- King's Shield
- Sacred Sword
- Shadow Sneak
- Swords Dance

Ferrothorn @ Leftovers
Ability: Iron Barbs
EVs: 252 Def / 252 HP / 4 Atk
Relaxed Nature
IVs: 0 Spd
- Leech Seed
- Spikes
- Stealth Rock
- Gyro Ball

Tentacruel @ Black Sludge
Ability: Clear Body
EVs: 240 Def / 252 HP / 16 Spd
Bold Nature
- Toxic Spikes
- Scald
- Sludge Bomb
- Rapid Spin

My main concerns so far is no special sweeper, and aegislash is on the fence with me so far, but I want to get opinions before changing.