Once you clean out fast priority and other physical attackers though they clean up and break shit. Honestly, if Scizor, Aegislash, and burd weren't just running around all willy nilly, they would both be A-. Or, you know, if those 20 attack points went to something useful.
On a side note, can someone explain to me why TTar is ranked the same as its mega? I'm not speaking against it, just wanna know what makes it so good, like what sets does each do better than the other, shit like that.
Regular Tyranitar has multiple effective sets, namely Choice Scarf, Choice Band, and Smooth Rock supporter.
The Scarf set is an excellent revenge killer against a multitude of offensive Pokemon, such as Bisharp, Mega Pinsir, Talonflame, Latios, Latis, and Mega Charizard Y, and it's fast Pursuit is a great way to get rid of Pursuit weak targets without even the need to take a hit sometimes, such as Latios, Latias, Gengar, Aegislash, and Mega Gardevoir.
The CB set hits very hard and can take a lot of punishment too, making it a great tank, and is also a great trapper.
Finally, Smooth Rock Tyranitar makes Sand Rush Excadrill a monster, while also providing SR for its team, and checking a many dangerous threats, making it an excellent support Pokemon.
All those sets together make Tyranitar a definite A+ Pokemon.
On the other hand, Mega Tyranitar's best and only set is the Dragon Dance set, which is one of the best sweepers in OU, hence its placement in A+. You can pull off a support set with SR or something, but Tyranitar's ability to hold Leftovers or Smooth Rock makes it a superior choice in general.
Dragon Dance Jolly TTar achieves almost the same thing as DD Jolly M-TTar anyway. It gets largely the same OHKOs. It outspeeds mostly the same things, with just one or two notable exceptions. It survives mostly the same hits. And running Leftovers gives you recovery that the mega lacks. So why use up the mega-slot?
Because not outspeeding Greninja is huge. It's the fastest relevant unscarfed threat outside of sand / rain, and getting revenge killed by it seriously limits the effectiveness of a late-game cleaner and sweeper. The loss of power is very important, as is the loss of bulk, especially in the physical side. Mega Tyranitar has the ability to take even STAB Bullet Punch from Scizor if the need arises, and can tank even two super effective priority hits as long as they aren't item boosted or Mach Punch:
- 252+ Atk Huge Power Azumarill Aqua Jet vs. 4 HP / 0 Def Mega Tyranitar: 114-134 (33.3 - 39.1%) -- guaranteed 3HKO
- 44+ Atk Technician Mega Scizor Bullet Punch vs. 4 HP / 0 Def Mega Tyranitar: 150-176 (43.8 - 51.4%) -- 7.8% chance to 2HKO
Yeah, Tyranitar can hold items, but even with the items taken into consideration, Mega Tyranitar is usually superior. If you use Leftovers, Mega Tyranitar is still bulkier initially, which is all that matters most of the time in order to get the DD boost. Meanwhile, it's also a lot stronger and faster. If you use Life Orb, Tyranitar may be stronger, but it's still slower, becomes vulnerable to getting worn down, and the opponent can revenge kill with priority users much easier, all of which are not worth the extra bit of power. Mega Tyranitar has the perfect combination of bulk, power, and Speed, which is what makes him such an excellent bulky sweeper. Take away any of that, and you have an inferior DD sweeper.