Sounds good. I would probably go with Earthquake, Crunch/Dark Pulse, Flamethrower, and Ice Beam/Thunderbolt. Any idea what the EV spread, Nature, and held item should be?
You could try with Focus Sash or Expert Belt, seeing how Bulky Tyranitar is and the coverage this set gives.
Nature i think it could be something for +Sp Attack and lowering your Speed sounds ok IMO since T-tar is very slow already.
No time for EV spread, maybe tomorrow =/