Tyranitar
Type: Rock/Dark
100/134/110/95/100/61
Tyranitar is an all-around great Pokemon for the OU metagame because of not only its brute strength, but its abilities that it brings to the table. Weather is very important to most teams, and Tyranitar automatically sets up a sandstorm to abuse. With that sandstorm comes a 50% boost to Special Defense of all Rock-type Pokemon, including Tyranitar. With this, Tyranitar can easily absorb Special Attacks (barring Fighting-type ones) and has a deep enough movepool and high enough offensive stats to hit hard back with moves such as Crunch, Stone Edge, Flamethrower, Ice Beam, and Pursuit. Most commonly, Tyranitar carries Leftovers, but in order to gain an advantage in either speed or power, Tyranitar is also often seen carrying either a Choice Scarf or a Choice Band. Overall, Tyranitar's high stats across the board (except speed), varying movesets, and large movepool, make it a large threat in the BW OU Metagame.
Type: Rock/Dark
100/134/110/95/100/61
Tyranitar is an all-around great Pokemon for the OU metagame because of not only its brute strength, but its abilities that it brings to the table. Weather is very important to most teams, and Tyranitar automatically sets up a sandstorm to abuse. With that sandstorm comes a 50% boost to Special Defense of all Rock-type Pokemon, including Tyranitar. With this, Tyranitar can easily absorb Special Attacks (barring Fighting-type ones) and has a deep enough movepool and high enough offensive stats to hit hard back with moves such as Crunch, Stone Edge, Flamethrower, Ice Beam, and Pursuit. Most commonly, Tyranitar carries Leftovers, but in order to gain an advantage in either speed or power, Tyranitar is also often seen carrying either a Choice Scarf or a Choice Band. Overall, Tyranitar's high stats across the board (except speed), varying movesets, and large movepool, make it a large threat in the BW OU Metagame.
I know it's hard for a Pokemon as flexible as Tyranitar, but try to keep it short! Substitute and Focus Punch can be removed because it's just not a common set anymore, Thunder Wave is also rare and doesn't really deserve a mention. Be careful with some phrases ("all three types weak to fire are super-effective against Tyranitar", what about Ice?). The writing is good, just try and work on cutting down the word count.