=== [gen8ou] av tenta rtsk ===
Tentacruel @ Assault Vest
Ability: Liquid Ooze
EVs: 252 HP / 20 Def / 12 SpA / 200 SpD / 24 Spe
Calm Nature
- Scald
- Knock Off
- Sludge Bomb
- Mirror Coat
Clefable @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 200 Def / 56 SpD
Calm Nature
IVs: 0 Atk
- Moonblast
- Soft-Boiled
- Flamethrower
- Thunder Wave
Dragonite @ Heavy-Duty Boots
Ability: Multiscale
EVs: 252 HP / 244 Def / 12 Spe
Relaxed Nature
- Ice Beam
- Earthquake
- Defog
- Roost
Diggersby @ Silk Scarf
Ability: Huge Power
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Quick Attack
- Earthquake
- Body Slam
- Swords Dance
Magnezone @ Choice Specs
Ability: Magnet Pull
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Thunderbolt
- Flash Cannon
- Volt Switch
- Steel Beam
Kartana @ Choice Scarf
Ability: Beast Boost
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Leaf Blade
- Sacred Sword
- Knock Off
- Smart Strike
I found this in a team dump, but its for gen8 OU, not Natdex like showderp is. You'd probably have to make some adjustments in order to fit a z move, and you might be able to fit a mega somewhere.