What am i doing with this team

Tentacruel @ Aguav Berry
Ability: Clear Body
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Waterfall
- Poison Jab
- Knock Off

Chansey (F) @ Life Orb
Ability: Serene Grace
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
IVs: 0 Atk
- Gravity
- Blizzard
- Thunder
- Soft-Boiled

Landorus-Therian (M)
Ability: Intimidate
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Substitute
- Swords Dance
- Rock Polish
- Fly

Accelgor @ Normalium Z
Ability: Hydration
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
- Me First
- Bug Buzz
- Spikes
- Focus Blast

Shedinja @ Choice Scarf
Ability: Wonder Guard
EVs: 252 Atk / 4 SpA / 252 Spe
- Giga Impact
- Bug Buzz
- Phantom Force
- Night Slash

Nihilego @ Leftovers
Ability: Beast Boost
EVs: 252 HP / 44 Def / 132 SpD / 80 Spe
Careful Nature
- Stealth Rock
- Toxic Spikes
- Pain Split
- Knock Off