Tyranitar

Mega Tyranitar is a slow, bulky offensive Pokemon that is capable of tanking powerful super effective moves from Pokemon like Genesect, Magnezone, and Heatran and KOing them back. It has one of the highest Attack stats available in the 1v1 metagame, with access to useful STAB moves in Rock Tomb and Crunch, coverage moves like Fire Punch, Superpower, and Earthquake, and utility moves like Dragon Dance and Taunt, which allow it to take on a large number of Pokemon such as Mega Charizard X, Mega Charizard Y, Dragonite, Genesect, Greninja, Mega Slowbro, and Heatran. Good bulk and a fantastic ability in Sand Stream, which raises its Special Defense by 50%, allow it to tank a number of strong attacks with appropriate defensive investment, Mega Tyranitar can tank two Outrages from Mega Charizard X, a Bug Buzz from Download-boosted Choice Specs Genesect, and a Hydro Cannon from Choice Specs Greninja. Its typing also gives it the upper hand versus Fire-, Normal-, and Ghost-types like Mega Charizard X, Mega Charizard Y, Porygon-Z, and Mega Gengar and gives it an immunity to Psychic-type moves from Pokemon like Necrozma. However, Rock is a weak defensive typing, and Mega Tyranitar has difficulty getting around stall because it has to give up arguably more valuable coverage moves for Taunt in order to do so. Mega Tyranitar is also a slow Pokemon, and this presents major drawbacks in its usage. It also has weaknesses to common attacking types in the 1v1 metagame, such as Fighting, Ground, Water, and Grass. As a result, it gets countered by the likes of Mega Lopunny, Landorus-T, Mega Gyarados, and Kartana.