Tyranitar

Tyranitar's combination of bulk, typing, and power allows it to check prominent threats such as Latios, Mega Charizard Y, Gengar, and Talonflame. In addition to this, its access to Sand Stream and Stealth Rock makes it a great support threat, as it assists Sand Rush Excadrill and Sand Force Mega Garchomp. Sand Stream itself boosts Tyranitar's Special Defense, meaning it can tank Latios's Draco Meteor with ease. Its great movepool allows it to lure in common switch-ins such as Mega Scizor and Landorus-T and KO them with a coverage move. Tyranitar can also take a role of a sweeper through its Mega Evolution, making it an unpredictable threat. However, while Tyranitar's typing allows it to check specific top-tier threats, Tyranitar is also easy to force out with the plethora of weaknesses it possesses. Even with a Choice Scarf, it is still slow, meaning Pokemon such as Mega Lopunny can easily force it out. Its lack of recovery also makes it easy to wear down.