i've used this before and it's nothing special, it's pretty gimmicky though the bulk is pretty incredible* it's nothing great since it loses out on speed you gain from scarf and it's taking up your mega slot as well. scarf ttar + a different mega does a better job 99% of the timeWould a defensive (Mega) Tyranitar set have any merit on stall? I mean when looking at it in its base form the defenses aren't bad combined along with the Sandstorm boost and the mega form has an even bigger boost to its defenses. If said set were to be ran I think it would be something like Stealth Rock, Taunt, Pursuit, and Stone Edge. I know it has a lot of weaknesses but could this be viable or just a really bad experiment?
*252 Atk Life Orb Technician Breloom Mach Punch vs. 252 HP / 4+ Def Mega Tyranitar: 328-390 (81.1 - 96.5%) -- guaranteed 2HKO < that wasn't my exact spread but you can find it in cb hoopa's victim of the week if you want it