pls help

Garchomp-Mega @ Garchompite
Ability: Sand Force
EVs: 180 HP / 252 Atk / 76 Spe
Adamant Nature
- Substitute
- Swords Dance
- Dragon Claw
- Earthquake

Aegislash @ Spooky Plate
Ability: Stance Change
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Shadow Sneak
- Shadow Claw
- Sacred Sword
- King's Shield

Keldeo @ Choice Specs
Ability: Justified
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Hydro Pump
- Scald
- Secret Sword
- Hidden Power [Flying]

Landorus-Therian (M) @ Choice Scarf
Ability: Intimidate
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Stone Edge
- U-turn
- Earthquake
- Knock Off

Heatran @ Leftovers
Ability: Flash Fire
EVs: 252 HP / 252 SpD / 4 Spe
Calm Nature
- Lava Plume
- Roar
- Stealth Rock
- Earth Power

Mandibuzz (F) @ Leftovers
Ability: Overcoat
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
- Defog
- Roost
- Foul Play
- Toxic