[Chou Toshio]

I have to agree that I have used such sets in the past, and they can work beautifully.

Example:

"Special"-Boah
Modest
@Leftovers
252 HP 76 Spd 180 Sp.ATK
-Dark Pulse
-Flamethrower
-Ice Beam
-Substitute

More special attack than traditional quiet boah, and yet has the speed to out-run 0 speed metagross and scizor.

Tyranitar is surprisingly effective at pulling in steel types like Lucario, Metagross, Foretress, Scizor, Bronzong, Jirachi and even Skarmory. It is also effective at scaring off a number of pokemon, including weak special attackers. The trick is simple enough, just like any Boah, Sub up as you scare the opponent out, however from here "Special" boah can procede to eliminate specific threats to your team, most notably steel types not named heatran or empoleon. Breloom also loves switching into this set just to get hit hard by ice beam/f-thrower. Heracross will come in to eat an occasional f-thrower as well.

Ice Beam is for Salamence, and even more importantly for Flygon-- and even Zapdos is not partial to taking one head on. It also lets you beat Gliscor, Hippowdon and Donphan.

Dark Pulse finds its greatest use against enemies who enjoy trying to stay in and burn TTar *cough*rotom-a*cough*, however even Gyarados and Swampert will not like having to take repeated hits from this.

Be wary of Heatran and Infernape who wall you (walled by infernape, xD).

Of course this can still make a useful check and switch in to a number of other pokemon, especially aforementioned special attackers like Azelf, Magnezone, Gengar (non LO), Starmie (don't switch in on water attack), Celebi (don't switch in on grass knot), rotom, cresselia, etc. etc. It can also kill Obi's wish-bliss in a stall war (or any bliss that has no seismic toss for that matter). xD