[WildAce]

@ AMN: Peck = Drill Peck. That should have been obvious.

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TYRANITAR:

Tyranitar @ Leftovers
Ability: Sandstream
Nature: Adamant / Jolly
Evs: 252 ATK / 252 Speed / 4 HP
- Dragon Dance
- Stone Edge / Crunch
- Earthquake
- Taunt / Ice Beam

The ever popular move Dragon Dance has another Excellent User.
Aside from the Nature, this set is pretty standard.
Stone Edge + Crunch are both STAB and provide great Coverage. Earthquake is for synchronisity with Stone Edge.
Taunt on TTar works just like TauntGyarados:
Basically, you Taunt a Walls (which generally tend to Phaze / Status you rather than outright attack).
Ice Beam takes care of Bulky Ground (and Ground PKMN in general) such as Donphan, Hippowdon, and Gliscor which could easilly wall TTar.

After 1 DD, the Adamant variant can outspeed Non +Speed Base 115ers.
The Jolly Variant can out outspeed ALL Base 115ers after one Dragon Dance.

Tyranitar @ Choice Band
Ability: Sandstream
Nature: Adamant
Evs: 252 ATK / 252 Speed / 4 HP
- Crunch / Pursuit
- Stone Edge
- Earthquake
- Focus Punch / Pursuit

Choice Band Tyranitar is the most common variant of TTar you see (atleast from my experience).
This set requires a lot of Prediction skills to use....and as such, is VERY Rewarding.

Pursuit can be used over Crunch if you want to make room for Focus Punch. With Focus Punch + Pursuit, your opponent will always be in a tough bind:
If they switch out, they could be pursuited...or even worse, get FPed.
If they stay in, they have to contend with a STAB, CBed Stone Edge or a CB EQ...both Very Deadly attacks.

Tyranitar @ Leftovers
Ability: Sand Stream
Nature: Mild
EVs: 252 HP / 68 Spd / 188 SAtk
- Focus Punch
- Dark Pulse
- Substitute
- Thunderbolt / Ice Beam

This variant is known as "Tyraniboah".
It was primarilly used in ADV. Gen to counter Skarmory and Blissey at the same time (though Crunch / Ice Beam was used over Dark Pulse).
The premise behind this thing is simple:
Thunderbolt Skarmory to oblivion, and put up a Substitute vs. Blissey.
With this being Diamond and Pearl, other physical threats (Hippowdon and especially Gliscor) prompt Boah to use Ice Beam over Thunderbolt.
Due to Sandstream's Sp.DEF increasing ability and TTar able to create 101 Subs, Blissey will almost NEVER beat this thing one on one.

[NOTE: After a fairly long discussion via AIM with Elly, I concluded that Boah is not really viable in DP because along with SkarmBliss, other walls such as Bronzong and Gliscor have also been added.]