The set for rock polish sweeper is as follows:
Tyranitar w/Life orb/babiri berry/chople berry/lum berry
252 Atk/252 Spe/6 Hp
Adamant nature
-Rock Polish
-Crunch/Pursuit
-Stone Edge
-Fire Punch/Earthquake/Superpower
Tyranitar's biggest obstacle has never been it's attack, but rather it's mediocre speed. Dragon Dance attempts to fix this problem, but tyranitar doesn't really need extra attack. What he needs is speed. Many special sweepers, such as azelf, gengar, and starmie will still outspeed you even after a dragon dance boost (unless you're using a jolly nature). With rock polish, this is no longer an issue. Tyranitar's special defense boost with sandstorm allows him to set up on many special sweepers that would normally 2HKO him (those that still outspeed him after a dragon dance boost). This set takes advantage of a move that boosts his speed by two stages instead of one.
I have not determined all the EV's needed to maximize the potential of this thread. I will edit this later with the correct EV's. I've determined that the ideal speed to shoot for is 198. After a single rock polish boost, this will boost your speed to 396, allowing you to outspeed aerodactyl, jolteon, and crobat. Don't bother trying to outspeed ninjask, because he will just protect the first turn, making your rock polish useless with the speed boost. It is recommended to max out your attack, use the correct number of EV's to reach 198 speed, and then put the rest of the EV's into HP for the extra bulk.
The strategy behind this is rather simple. Bring tyranitar in on a special attacker that tyranitar walls completely, such as heatran, zapdos, jolteon, or magnezone. The opponent will probably switch, allowing you to get a rock polish boost up and then proceeding to sweep. Crunch or pursuit is chosen as the first attack for stab. Choose crunch if you want the extra power, or choose pursuit to punish fleeing psychic/ghost types. Stone edge is also chosen for stab. Stealth rock support is especially important, to insure the OHKO on gyarados, zapdos, and other bulky flying types. Remember that you will not be getting the attack boost from dragon dance, so any extra support is welcomed. Finally, fire punch lets you deal with scizor and other steel types. Earthquake hits magnezone, heatran, and opposing tyranitar harder than fire punch (heatran is immune to fire punch actually). Finally, superpower hits opposing tyranitar and some steel types harder than earthquake does, but the attack and defense drop is annoying.
As far as items are concerned, you have a multitude of options. Life orb may be chosen if you favor an attack boost, as you will have no other means of boosting your attack. A babiri berry is also a useful item for tyranitar, as it may prevent scizor from ending your sweep (assuming you haven't taken a lot of prior damage). A chople berry is also a decent option because it allows you to survive a focus blast from gengar and set up on him. Finally, lum berry is an option if you have issues with thunder wave, breloom with spore, or will o wisp users.
I worked very hard on this set. I know it's not perfect, but I will update this in the future after obtaining the best possible EV spread.
Tyranitar w/Life orb/babiri berry/chople berry/lum berry
252 Atk/252 Spe/6 Hp
Adamant nature
-Rock Polish
-Crunch/Pursuit
-Stone Edge
-Fire Punch/Earthquake/Superpower
Tyranitar's biggest obstacle has never been it's attack, but rather it's mediocre speed. Dragon Dance attempts to fix this problem, but tyranitar doesn't really need extra attack. What he needs is speed. Many special sweepers, such as azelf, gengar, and starmie will still outspeed you even after a dragon dance boost (unless you're using a jolly nature). With rock polish, this is no longer an issue. Tyranitar's special defense boost with sandstorm allows him to set up on many special sweepers that would normally 2HKO him (those that still outspeed him after a dragon dance boost). This set takes advantage of a move that boosts his speed by two stages instead of one.
I have not determined all the EV's needed to maximize the potential of this thread. I will edit this later with the correct EV's. I've determined that the ideal speed to shoot for is 198. After a single rock polish boost, this will boost your speed to 396, allowing you to outspeed aerodactyl, jolteon, and crobat. Don't bother trying to outspeed ninjask, because he will just protect the first turn, making your rock polish useless with the speed boost. It is recommended to max out your attack, use the correct number of EV's to reach 198 speed, and then put the rest of the EV's into HP for the extra bulk.
The strategy behind this is rather simple. Bring tyranitar in on a special attacker that tyranitar walls completely, such as heatran, zapdos, jolteon, or magnezone. The opponent will probably switch, allowing you to get a rock polish boost up and then proceeding to sweep. Crunch or pursuit is chosen as the first attack for stab. Choose crunch if you want the extra power, or choose pursuit to punish fleeing psychic/ghost types. Stone edge is also chosen for stab. Stealth rock support is especially important, to insure the OHKO on gyarados, zapdos, and other bulky flying types. Remember that you will not be getting the attack boost from dragon dance, so any extra support is welcomed. Finally, fire punch lets you deal with scizor and other steel types. Earthquake hits magnezone, heatran, and opposing tyranitar harder than fire punch (heatran is immune to fire punch actually). Finally, superpower hits opposing tyranitar and some steel types harder than earthquake does, but the attack and defense drop is annoying.
As far as items are concerned, you have a multitude of options. Life orb may be chosen if you favor an attack boost, as you will have no other means of boosting your attack. A babiri berry is also a useful item for tyranitar, as it may prevent scizor from ending your sweep (assuming you haven't taken a lot of prior damage). A chople berry is also a decent option because it allows you to survive a focus blast from gengar and set up on him. Finally, lum berry is an option if you have issues with thunder wave, breloom with spore, or will o wisp users.
I worked very hard on this set. I know it's not perfect, but I will update this in the future after obtaining the best possible EV spread.