Excadrill

Excadrill is one of the best Pokemon in the tier. Its excellent defensive typing and decent natural bulk make it able to switch into Pokemon like Latios, Tyranitar, Reuniclus lacking Focus Blast, and Jirachi. It is hard to wear down because of its 4x resistance to Stealth Rock and immunity to sand; this means Excadrill recovers more health from Leftovers and can effectively run Protect, making it even harder to wear down. It is incredible offensively because it's so strong and has good STAB attacks, which makes it hard to defensively answer, and Sand Force and Mold Breaker further this by changing how the opponent has to approach handling Excadrill. Because of these things and being able to threaten the most common entry hazard setters in the tier, mainly Tyranitar, Heatran, Jirachi, and Ferrothorn, it's the best spinner in the tier. This ability to support its team so well makes Excadrill work with many of the best Pokemon in the tier, and as such, it fits on a wide variety of teams and is pretty much always useful in a game. However, it doesn't have the greatest natural Speed tier, so it can be offensively checked by Pokemon such as Landorus-T, Garchomp, and Keldeo. It also has common weaknesses, which means it needs to be careful around the Pokemon it usually wants to come in on, mainly Latios and Tyranitar, since they run super effective coverage. On top of this, good checks like Air Balloon + Magnet Rise Magnezone, Garchomp, Landorus-T, Keldeo, Rotom-W, Skarmory, and Gliscor are also quite common, which limits its overall viability and ability to come in.