SM OU I need help with my Zeraora OU team

[GATAZO]

I've been using this team for a while now but as I get higher on the ladder (I'm only at 1400) I've noticed it lacks something, but I can't figure out what.



Greninja @ Choice Specs
Ability: Battle Bond
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Hydro Pump
- Dark Pulse
- Water Shuriken
- U-turn

Zeraora @ Life Orb
Ability: Volt Absorb
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature
- Plasma Fists
- Close Combat
- Fire Punch
- Hidden Power [Ice]

Landorus-Therian @ Choice Scarf
Ability: Intimidate
EVs: 18 HP / 186 Atk / 16 Def / 54 SpD / 234 Spe
Jolly Nature
- Earthquake
- U-turn
- Stone Edge
- Defog

Heatran (M) @ Leftovers
Ability: Flash Fire
EVs: 72 HP / 146 SpA / 90 SpD / 200 Spe
Timid Nature
IVs: 0 Atk
- Magma Storm
- Earth Power
- Stealth Rock
- Toxic

Tapu Lele @ Fightinium Z
Ability: Psychic Surge
EVs: 6 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Psychic
- Moonblast
- Focus Blast
- Calm Mind

Tangrowth (M) @ Assault Vest
Ability: Regenerator
Shiny: Yes
EVs: 184 HP / 58 Atk / 16 Def / 66 SpA / 184 SpD
Sassy Nature
- Giga Drain
- Sludge Bomb
- Earthquake
- Hidden Power [Fire]

I've tried making some changes like swapping M-Venusaur for Tangrowth or trying out different movesets, but I don't feel they quite work out. If someone could help it would be greatly appreciated. Thank you.

 

[Snowy]

Welcome to Smogon! I'm locking your RMT for the time being as the forum rules require that you provide in-depth descriptions for each Pokemon to explain their roles. Please read the rules carefully and take a look at Team Showcase to see the level of detail we require. PM me with updated descriptions and I'll be happy to unlock this.