Heracross-Mega @ Heracronite  
Ability: Skill Link  
EVs: 80 HP / 252 Atk / 176 Spe  
Adamant Nature  
- Rock Blast  
- Earthquake  
- Substitute  
- Swords Dance

Dwebble @ Rockium Z  
Ability: Sturdy  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Shell Smash  
- Rock Wrecker  
- Rock Blast  
- Counter

Volcarona @ Choice Scarf  
Ability: Flame Body  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Overheat  
- Flamethrower  
- Hidden Power [Rock]  
- Hurricane

Analysis:

Dwebble is the main pokemon on this team. It deals with meta threats such as Pinsir-Mega and Volcarona.
List of Dwebble Wins:
      Pinsir-Mega
      Volcarona
      Durant (Scarf)
      Armaldo
      Vikavolt
      Shuckle
      Scolidpede
      Araquanid
      Scyther
      Pheromosa
      Yanmega
      Beedrill-Mega
      Larvesta
      Ribombee
      Golisopod
      Yanma
      Ninjask
      Galvantula
      Accelgor
      Shedinja

Volcarona is also a major pokemon on this team, and beats everything that beats Dwebble. (HP-Rock is for the mirror matchup)
List of Volcarona wins:
     Scizor-Mega
     Heracross-Mega
     Venomoth
     Vivillon
     Durant (Rockium)

Heracross-Mega is basically there just to beat dwebble and nothing else. But he does also beat Shuckle.