I am VERY new to competitive. Would like some feedback on this team. Kind of just put together my favorite OU pokes and I just like Chandelure so

Landorus-Therian (M) @ Expert Belt
Trait: Intimidate
EVs: 252 Def / 252 HP / 4 Atk
Adamant Nature
- Hidden Power [Ice]
- Stealth Rock
- Earthquake
- U-turn

Keldeo @ Choice Scarf
Trait: Justified
EVs: 252 Spd / 252 SAtk / 4 SDef
Timid Nature
- Hidden Power [Ice]
- Secret Sword
- Surf
- Hydro Pump

Gastrodon @ Leftovers
Trait: Storm Drain
EVs: 252 SDef / 252 HP / 4 Def
Calm Nature
- Scald
- Recover
- Toxic
- Ice Beam

Donphan @ Leftovers
Trait: Sturdy
EVs: 252 Atk / 252 HP / 4 SDef
Adamant Nature
- Rapid Spin
- Earthquake
- Ice Shard
- Superpower

Miltank (Vaporeon) (F) @ Leftovers
Trait: Water Absorb
EVs: 8 SDef / 248 HP / 252 Def
Bold Nature
- Heal Bell
- Roar
- Wish
- Baton Pass

Chandelure @ Choice Scarf
Trait: Flash Fire
EVs: 252 SAtk / 252 HP / 4 SDef
Modest Nature
- Flamethrower
- Trick
- Hidden Power [Ground]
- Shadow Ball

I think having both Vaporeon and Gastrodon is kind of redundant, so Gastrodon should probably be replaced, but with who?