Tyranitar

Tyranitar has a great offensive and defensive typing with the stats to back it up. Rock Slide and Crunch together hit most of the tier for consistent damage, and unique resistances and amazing defensive stats enable Tyranitar to check top-tier Pokemon such as Mega Salamence, Mega Charizard Y, and Hoopa-U. Tyranitar also matches up well against speed control users such as Zapdos and Mega Salamence. Furthermore, Tyranitar's low Speed can be used to its advantage, as it beats the most common Trick Room user, Hoopa-U, with its defensive typing. Tyranitar also has an incredibly diverse movepool that includes premier coverage moves such as Ice Beam, Fire Blast, and Low Kick and can properly utilize them with its good mixed offenses. Tyranitar is also able to effectively use many item options such as Choice Band, Z-Crystals, Tyranitarite, and resistance Berries; this makes it a truly unpredictable threat. Sand Stream gives Tyranitar a lot of utility; it not only gives Tyranitar a 50% boost in Special Defense but also removes opposing weather, deals chip damage, invalidates Focus Sash, and scouts foes' Speed. However, Tyranitar has plenty of weaknesses to common attacking types such as Ground, Water, and especially Fighting, which are carried by common threats such as Landorus-T. Low Speed makes Tyranitar reliant on its bulk and speed control, although Mega Tyranitar is able to patch up its speed by Mega Evolving and setting up a Dragon Dance.