Tyranitar @ Chople Berry / Leftovers
Ability: Sand Stream  
EVs: 248 HP / 76 Atk / 148 Def / 36 Spe  
Adamant Nature  
- Pursuit  
- Diamond Storm / Rock Tomb  
- Knock Off / Foul Play
- Shore Up
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Optional Move(s):
- Toxic
- Parting Shot
- Stealth Rock
- Spikes
Optional Item(s)
- Lum Berry  
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Overview:
Tyranitar's typing and solid bulk lets it check Ho-oh, Mega-Salamence, Lunala, Yveltal and Mega Gengar. Its useful utility consist of Pursuit, Knock Off and Stealth Rock to support its teammates. On the downside, its typing has a crippling weakness to Ground, Fairy, Steel and Fighting, with latter being quite a nuisance because Ghost-Types and Psychic-Types it tends to Pursuit trap tends to carry these coverage moves in Focus Blast and Superpower, making it shaky as a trapper and forces it to run Chople Berry to reliably trapped them. While it has some good utility moves, it is unable to fit all of them.