Tyraniboah, IIRC, was used in gen 3 and was essentially just a mixed Tyranitar set: Dark Pulse/Flamethrower/Focus Punch/Substitute. Alternatives were Tbolt instead of Flamethrower or Crunch instead of Dark Pulse. The EVs were 252 HP and then some mix of Atk, SpA, and Spe. Sub-Punch was meant specifically for Blissey and Tbolt/Flamethrower was meant for Steel-types like Jirachi, Skarmory, Scizor, Magnezone, Forretress, and Bronzong. (This was a time when SkarmBliss was a common defensive core. Salamence was also in Ubers I think.)Figure I'll drop this here before I go off and build a whole team around it, anyone here think Tyraniboah could be revived? Was thinking about using Mega TTar, to keep up with power creep.
I don't really think such a set would work in XY OU. For one, if you plan on using Mega-Ttar, then he's best used as a DDer since he becomes one of the most powerful sweepers in the metagame. Also, the set just targets pokemon that are no longer threats or as common as they once were, or are now checked/countered by better pokemon. The ADV OU metagame was much different. (As an example of how different it was, I think the only dragon in the meta was Flygon since Salamence and Lati twins were banned to Ubers.) The set will also struggle with Fairy-types since they resist both Dark and Fighting. The filler Flamethrower/Tbolt would have to serve as coverage, and even AV Azumarill counters the set quite well:
176+ SpA Tyranitar Thunderbolt vs. 16 HP / 240 SpD Assault Vest Azumarill: 102-120 (29.5 - 34.7%) -- guaranteed 3HKO after sandstorm damage
252+ Atk Huge Power Azumarill Play Rough vs. 252 HP / 0 Def Tyranitar: 330-390 (81.6 - 96.5%) -- guaranteed 2HKO after Leftovers recovery
252+ Atk Huge Power Azumarill Aqua Jet vs. 252 HP / 0 Def Tyranitar: 150-176 (37.1 - 43.5%) -- 99.2% chance to 3HKO after Leftovers recovery
So AV Azumarill would be able to hard switch in and win (Play Rough then Aqua Jet), even if you run Tbolt. (The next best option is Focus Punch, which has a 31.3% to 4HKO.)