Oscarus

I've never noticed it before... but seeing how Tyranitar can be dangerous on Glitch Field, it truly comes as a surprise how versatile this Pokemon is. 

Why, you ask? Because I have just recently realized, while playing some competitive, how Tyranitar's special bulk might come onto play. But step by step: 

• Tyranitar has 100 Base Special Defense, which equals to a maximum of 328.
• Thanks to Sand Stream, its' Special Defense is increased by 50%, as a nature of being a Rock type
• Assault Vest also increases Special Defense by 50%, but wearer can use attacks (which isn't a issue in Tyranitar's case as it don't have any reliable status move that increases Special Defense or such) 
• That makes its' Special Defense (and therefore a Special Attack as well) an astounding 738! For comparison, Mega Mewtwo Y's Special Attack caps at 535, barring any stat changes. 
• Tyranitar also has powerful Special movepool with:
  • Flamethrower/Fire Blast 
  • Thunderbolt/Thunder 
  • Ice Beam/Blizzard 
  • Dragon Claw/Outrage (which are Special on Glitch Field) 
  • Surf

Honestly, I've gotta check and try if my theory is true. If yes, then I'm much better battle-designer than I thought I was