A++ Rock - Mega Diancie Offense

Diancie-Mega @ Diancite
Ability: Clear Body
EVs: 44 Atk / 212 SpA / 252 Spe
Naive Nature
- Moonblast
- Earth Power
- Diamond Storm
- Protect

Terrakion @ Choice Band
Ability: Justified
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Close Combat
- Stone Edge
- Earthquake
- Quick Attack

Tyranitar @ Assault Vest
Ability: Sand Stream
EVs: 252 HP / 124 Atk / 132 SpD
Sassy Nature
- Stone Edge
- Crunch
- Flamethrower
- Pursuit

Cradily @ Leftovers
Ability: Storm Drain
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
- Giga Drain
- Mirror Coat
- Toxic
- Recover

Rhyperior @ Leftovers
Ability: Solid Rock
EVs: 212 HP / 44 Atk / 252 Def
Adamant Nature
- Earthquake
- Stone Edge
- Fire Punch
- Avalanche

Shuckle @ Mental Herb
Ability: Sturdy
EVs: 248 HP / 252 Def / 8 SpD
Impish Nature
- Knock Off
- Encore
- Sticky Web
- Stealth Rock