SM OU greninja-ash and landorus

[Kagami14]

Greninja-Ash @ Choice Specs
Ability: Battle Bond
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Hydro Pump
- Dark Pulse
- Water Shuriken
- ice beam

Celesteela @ Leftovers
Ability: Beast Boost
EVs: 252 HP / 4 Def / 252 SpD
Careful Nature
- Leech Seed
- Heavy Slam
- Earthquake
- Protect

Tapu Koko @ Electrium Z
Ability: Electric Surge
EVs: 252 SpA / 252 Spe / 4 def
Timid Nature
- Thunderbolt
- Dazzling Gleam
- Volt Switch
- Protect

Landorus-Therian @ Choice Scarf
Ability: Intimidate
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Earthquake
- Rock Slide
- U-turn
- Stone Edge

Marowak-Alola @ Thick Club
Ability: Lightning Rod
EVs: 252 HP / 180 Atk / 4 Def / 68 SpD / 4 Spe
Adamant Nature
- Flare Blitz
- Shadow Bone
- Bonemerang
- Detect

Ferrothorn @ Rocky Helmet
Ability: Iron Barbs
EVs: 252 HP / 68 Def / 188 SpD
IVs: 0 Spe
Relaxed Nature
- Leech Seed
- toxic
- Gyro Ball
- Stealth Rock

Help me to make a good team thank you