Mega-Venusaur

[Trompelemonde]

I'm trying to build a team around Mega-Venusaur and Idk how I feel about it so far, could I get some opinions and maybe some recommendations? thank you ahead of time

Venusaur-Mega @ Venusaurite  
Ability: Thick Fat  
EVs: 236 HP / 96 Def / 16 SpA / 144 SpD / 16 Spe  
Bold Nature  
IVs: 0 Atk / 30 SpA / 30 Spe  
- Giga Drain  
- Hidden Power [Fire]  
- Leech Seed  
- Sludge Bomb  

Heatran @ Leftovers  
Ability: Flash Fire  
EVs: 228 HP / 252 SpA / 8 SpD / 20 Spe  
Modest Nature  
IVs: 0 Atk  
- Taunt  
- Earth Power  
- Flash Cannon  
- Lava Plume  

Landorus-Therian @ Choice Scarf  
Ability: Intimidate  
EVs: 252 Atk / 4 SpA / 252 Spe  
Naive Nature  
- U-turn  
- Earthquake  
- Knock Off  
- Hidden Power [Ice]  

Starmie @ Life Orb  
Ability: Natural Cure  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Rapid Spin  
- Recover  
- Scald  
- Psyshock  

Tornadus-Therian @ Assault Vest  
Ability: Regenerator  
EVs: 76 HP / 4 Atk / 176 SpA / 252 Spe  
Hasty Nature  
- U-turn  
- Hurricane  
- Heat Wave  
- Knock Off  

Ferrothorn @ Rocky Helmet  
Ability: Iron Barbs  
EVs: 248 HP / 8 Atk / 252 Def  
Relaxed Nature  
IVs: 0 Spe  
- Gyro Ball  
- Leech Seed  
- Stealth Rock  
- Spikes