Scrafty @ Leftovers  
Ability: Shed Skin  
EVs: 252 HP / 4 Atk / 252 SpD  
Careful Nature  
- Bulk Up  
- Drain Punch  
- Knock Off / Ice Punch
- Rest

Role
Scrafty is yet another bulky mon with nice defenses but crappy HP outside of Godly Gift. This set with inherited HP from Giratina helps it out a lot, even being able to live a dazzling gleam from timid Tapu Koko with inherited 154 SpA from Mewtwo. Not that it's supposed to get hit by dazzling gleam ofcourse but it's a fun little fact for ya. 

Set
Max Hp and max SpD makes Scrafty as bulky as possible on the special defensive side. Because of its 115 base Defense stat its able to live hits on the physical side as well (see calcs). Bulk up gives it the Attack and Defense boost it needs in order to survive. Rest + Shed skin gives it a 33% chance to wake up each turn. Shed skin also makes it not afraid to get burned, paralysed or poisoned. Drain Punch is its secondary recovery move. Knock off for stab and knocking off items (obviously). Ice Punch is optional for it to be able to deal with landorus, Garchomp, Nidoking and Swellow better, but Knock Off is preferred. This mon also LOVES Stealth Rock/spikes support for reliably dealing with its threats. 

Calcs (Defensive)
252 SpA Choice Specs Swellow Air Slash vs. 252 HP / 252+ SpD Scrafty: 228-270 (45.2 - 53.5%) -- 1.2% chance to 2HKO after Leftovers recovery (inherited 120 SpA from Arceus)
252+ Atk Groudon-Primal Precipice Blades vs. +1 252 HP / 0 Def Scrafty: 163-193 (32.3 - 38.2%) -- 2% chance to 3HKO after Leftovers recovery
252 SpA Alakazam-Mega Focus Blast vs. 252 HP / 252+ SpD Scrafty: 214-254 (42.4 - 50.3%) -- guaranteed 3HKO after Leftovers recovery
252 Atk Ho-Oh Brave Bird vs. +1 252 HP / 0 Def Scrafty: 234-276 (46.4 - 54.7%) -- 8.2% chance to 2HKO after Leftovers recovery
252 SpA Life Orb Sheer Force Nidoking Sludge Wave vs. 252 HP / 252+ SpD Scrafty: 196-231 (38.8 - 45.8%) -- guaranteed 3HKO after Leftovers recovery (inherited 154 SpA from Mewtwo)
252+ Atk Thick Club Marowak-Alola Flare Blitz vs. +1 252 HP / 0 Def Scrafty: 240-283 (47.6 - 56.1%) -- 27.3% chance to 2HKO after Leftovers recovery (Inherited 120 Atk from Arceus)
252 Atk Kartana Sacred Sword vs. 252 HP / 0 Def Scrafty: 226-266 (44.8 - 52.7%) -- guaranteed 3HKO after Leftovers recovery

Calcs (Offensive)
+1 4 Atk Scrafty Knock Off (97.5 BP) vs. 0 HP / 4 Def Swellow: 216-255 (82.7 - 97.7%) -- guaranteed OHKO after Stealth Rock
+1 4 Atk Scrafty Knock Off (97.5 BP) vs. 104 HP / 0 Def Ho-Oh: 157-186 (41.4 - 49%) -- guaranteed OHKO after Stealth Rock and Brave Bird recoil damage
+1 4 Atk Scrafty Drain Punch vs. 4 HP / 0 Def Kartana: 176-210 (67.6 - 80.7%) -- guaranteed 2HKO after Stealth Rock
+1 4 Atk Scrafty Knock Off vs. 0 HP / 4 Def Alakazam-Mega: 168-198 (66.9 - 78.8%) -- guaranteed 2HKO after Stealth Rock (inherited 120 Defense from Arceus)
+1 4 Atk Scrafty Knock Off (97.5 BP) vs. 0 HP / 0 Def Nidoking: 178-211 (58.7 - 69.6%) -- guaranteed 2HKO after Stealth Rock