New to VGC - First crack at a team. Any thoughts? Be as brutal as you like. Got a win rate of about 50%.

Question

Aegislash @ Life Orb
Ability: Stance Change
EVs: 252 HP / 4 Def / 252 SpA
Quiet Nature
- King's Shield
- Shadow Sneak
- Iron Head
- Wide Guard

Hydreigon @ Choice Band
Ability: Levitate
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Outrage
- Crunch
- Rock Slide
- U-turn

Heatran @ Leftovers
Ability: Flash Fire
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
- Heat Wave
- Flash Cannon
- Earth Power
- Protect

Thundurus @ Sitrus Berry
Ability: Prankster
EVs: 252 HP / 128 Def / 128 SpD
Bold Nature
- Thunder Wave
- Hidden Power [Ice]
- Thunderbolt
- Taunt

Lopunny @ Lopunnite
Ability: Cute Charm
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Fake Out
- Low Kick
- Ice Punch
- Protect

Venusaur @ Venusaurite
Ability: Overgrow
EVs: 252 HP / 252 SpA
Modest Nature
- Sludge Bomb
- Giga Drain
- Leech Seed
- Protect

Edit: Win rate has plummeted so I'm clearly doing something wrong.

Comments

Two things that definitely look out of place are Aegislash and Hydreigon. Aegislash has full Sp. Attack investment and a positive nature, but physical moves. Maybe try Shadow Ball + Flash Cannon > Shadow Sneak + Iron Head?

Second, Hydreigon doesn't make a very good physical attacker. Outrage is a poor move due to the sheer amount of Gardevoir and Sylveon out there. I would suggest either using a Specs / Scarf set with Dark Pulse / Draco Meteor / Fire Blast / Earth Power or switching to Landorus-Therian.

Lando can either use a Scarfed set or keep the Choice Band. It does a much better job at abusing fast Rock Slides and U-Turns than Hydreigon. It also has Intimidate, helping to bulk up your team.

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I could try to do an answer on this shortly. Which Mega do you want the team based around because I will change the second Mega, so would you rather have Lopunny or Venusaur?