I need suggestions for a Specially Defensive/bulky mon viable in the upcoming tournament. So far I've got:

Mega Kanga insurance: Avalugg@Rocky Helmet/Lefties
Impish
Sturdy
252 HP/252 Def/4 Atk
Avalanche
Double Edge/Earthquake
Recover
Mirror Coat

Bulky special attacker: Aurorus@Expert Belt/Wise Glasses
Modest
Refrigerate
248 HP/252 Sp Atk/8 Spd
Ancient Power
Nature Power
Flash Cannon
Rock Polish

Mixed Wallbreaker: Exploud@Life Orb
Mild or Neutral nature?
Soundproof
252 HP/ 104 Atk / 152 SpA
Work Up
Boomburst
Shadow Ball
Earthquake

Mega Slot: Gengar@Gengarite
Timid
4 HP/252 SpAtk/252 Spd
Shadow Ball
Energy Ball
Destiny Bond
Sludge Bomb

Physical Attacker: Leavanny@Air Balloon
Jolly
4 HP/252 Atk/252 Spd
Return/Leaf Blade
X Scissor
Substitute
Swords Dance

>Special defensive/bulky mon

Any modifications on this team would be highly appreciated :)