Team Options
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Bringing either a Tyranitar or Hippowdon is mandatory to set up the sandstorm necessary for Excadrill to abuse Sand Rush. The problem with them is that they share weaknesses with Excadrill including Water, Fighting, and Ground. You also need a teammate that can easily take care of Azumarill, which is probably Sand Rush Excadrill's biggest threat. Venusaur and Roserade work well, as they resist Excadrill's— as well as Tyranitar's or Hippowdon's— weaknesses and can also deal with Azumarill well. Serperior can also come in and start setting up Leaf Storm boosts against most things that threaten Excadrill's sweep. Latias and Latios make for good partners, as they resist Water and Fighting while being immune to Ground thanks to Levitate, while Excadrill resists their Dragon, Fairy, and Bug weaknesses. They can also manually set up sandstorm, while Latias can even use Healing Wish to get Excadrill in safely and also heal it in the process.