http://www.smogon.com/dp/pokemon/tyranitar
Tyranitar Dragon Dance Set
It looks like it got mixed up a bit...
"This set may not pose the same immediate threat as the Choice Bander does, but it is capable of running through an entire team when played correctly. Stone Edge and Crunch provide the deadly dual STAB combination that Tyranitar is famous for. Fire Punch rounds off the set by giving an option to hit Steel-types, such as Forretress, Lucario, and perhaps most importantly, Scizor, for super effective damage.
However,
Choosing between Adamant or Jolly is choosing whether you want to do more damage, or be able to
outspeed more Aqua Tail is also a good option as it allows you to effectively deal with Hippowdon, Gliscor, and Heatran as well as gaining better type coverage. Earthquake gives you an immediate OHKO on Jirachi and even the standard Metagross after some residual damage. Earthquake also won't miss where it counts against a Pokemon such as Infernape or an enemy Tyranitar.
things, respectively. If you choose Adamant, after one Dragon Dance, Tyranitar will reach 332 Speed, which is enough to outspeed neutral base 115s and positive natured base 100s. Jolly allows Tyranitar to reach 364 Speed, which allows you to beat everything up to positive-natured base 115s, including Azelf and Starmie. Often the extra Speed is necessary to prevent you from being revenge killed by speedy threats such as Infernape and Latias, at the cost of losing the chance to OHKO or 2HKO many of the bulkier walls."
I think it's supposed to be this:
This set may not pose the same immediate threat as the Choice Bander does, but it is capable of running through an entire team when played correctly. Stone Edge and Crunch provide the deadly dual STAB combination that Tyranitar is famous for. Fire Punch rounds off the set by giving an option to hit Steel-types, such as Forretress, Lucario, and perhaps most importantly, Scizor, for super effective damage. However, Aqua Tail is also a good option as it allows you to effectively deal with Hippowdon, Gliscor, and Heatran as well as gaining better type coverage. Earthquake gives you an immediate OHKO on Jirachi and even the standard Metagross after some residual damage. Earthquake also won't miss where it counts against a Pokemon such as Infernape or an enemy Tyranitar.
Choosing between Adamant or Jolly is choosing whether you want to do more damage, or be able to outspeed morethings, respectively. If you choose Adamant, after one Dragon Dance, Tyranitar will reach 332 Speed, which is enough to outspeed neutral base 115s and positive natured base 100s. Jolly allows Tyranitar to reach 364 Speed, which allows you to beat everything up to positive-natured base 115s, including Azelf and Starmie. Often the extra Speed is necessary to prevent you from being revenge killed by speedy threats such as Infernape and Latias, at the cost of losing the chance to OHKO or 2HKO many of the bulkier walls.
EDIT: Also, in the Choice Scarf set:
"Tyranitar edges out many dangerous Over
used threats such as Starmie, Azelf, Infernape, Gengar, Salamence, and Lucario, and scores an OHKO on all of them."