Heracross-Mega @ Heracronite  
Ability: Moxie  
EVs: 80 HP / 252 Atk / 4 Def / 172 Spe  
Adamant Nature  
- Swords Dance  
- Substitute  
- Close Combat  
- Rock Blast

HP investment means it's sub doesn't break against no atk investment Tapu Bulu's Horn Leech and Tangrowth's Sludge Bomb 

Heracross-Mega @ Heracronite  
Ability: Moxie  
EVs: 252 Atk / 4 Def / 252 Spe  
Adamant Nature  
- Swords Dance  
- Pin Missile  
- Close Combat  
- Rock Blast