I suggest people try using both Sand Stream pokemon together. Sassy Assault Vest Tyranitar is a GOD, and physically defensive Hippowdon is nearly as good even without a boosting item. (I'm also desperately trying to push Magnezone into this team, but he doesn't seem to fit :( )
Here's something I dug up from DPP OU: CurseTar
Tyranitar @ Leftovers
Careful
Sand Stream
252 HP / 40 Def / 216 SpD
-Curse
-Crunch/Payback
-Sleep Talk
-Rest
Scarf Magnezone traps and kills Lucario (not sure about MegaLucario, a tad bulkier), Ferrothorn, and Scizor, and threatens Fairies with Flash Cannon, and threatens Azumarill with TBolt. Gengar is using focus blast less and less, fighting type pokemon like terrakion and keldeo are rare, and rain teams are rare too. I'm not sure how Aegislash fits in with the Cursetar+Scarfzone idea, but i'm pretty sure Aegislash beats both of them...which brings us to Hippowdon, the perfect thing to round out the 3-man core.
Edit: Lucario and MegaLucario have the same special bulk. Timid Scarf Zone only does 54.25 - 64.18% with Volt Switch and 70.21 - 82.97% with Thunderbolt.
Double Edit for your trouble: Plus nature base 115s are faster than ScarfZone by 1 point but MegaLucario's base speed is only 112
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