Monotype Rock, Aggron-Mega Style

Shuckle @ Mental Herb
Ability: Sturdy
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
- Toxic
- Encore
- Sticky Web
- Stealth Rock

Diancie @ Leftovers
Ability: Clear Body
EVs: 252 HP / 52 Def / 200 SpA / 4 SpD
Quiet Nature
IVs: 30 Atk / 30 SpA / 2 Spe
- Psychic
- Diamond Storm
- Moonblast
- Hidden Power [Fire]

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

Cradily @ Leftovers
Ability: Storm Drain
EVs: 252 HP / 200 Def / 4 SpA / 52 SpD
Bold Nature
- Giga Drain
- Earth Power
- Recover
- Toxic

Aggron @ Aggronite
Ability: Sturdy
EVs: 252 HP / 100 Atk / 156 Def
Impish Nature
- Fire Punch
- Earthquake
- Thunder Wave
- Heavy Slam

Tyranitar @ Assault Vest
Ability: Sand Stream
EVs: 252 HP / 104 Atk / 4 Def / 148 SpD
Brave Nature
- Fire Blast
- Crunch
- Ice Beam
- Stone Edge