Hippowdon @ Eject Button
Ability: Sand Stream
EVs: 252 HP / 80 Def / 176 SpD
Impish Nature
- Stealth Rock
- Earthquake
- Slack Off
- Whirlwind
This is the UU Mixed set. It works well because you're guaranteed to live Devastating Drake after rocks 100% of the time, giving you a free switch to something that beats Nagandel. That's basically all it's used for besides setting sand for drill and steelix.
Excadrill @ Steelium Z
Ability: Sand Rush
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Iron Head
- Earthquake
- Swords Dance
- Rock Slide
Basically the center of the team. Sand rush drill is one of your ways to beat Naganadel, while also beating Lati and Kyurem-B under sand. Usually would be Adamant, but Jolly was chosen because it outspeeds Naganadel at +1 under sand, as well as the entire team otherwise. Steelium Z is solely for either Latios or Kyurem, more so Lati because it picks up the kill. You can also use Iron Plate or Life Orb if you want more consistent damage output, but the one time nuke to kill something is nice to have.
Steelix-Mega @ Steelixite
Ability: Sand Force
EVs: 252 HP / 16 Atk / 128 Def / 112 SpD
Impish Nature
- Heavy Slam
- Earthquake
- Toxic / Sleep Talk
- Rest
I chose M-Steelix because it helps me outside of sand vs stuff like D-Nite and Altaria. The spread itself does several things. 252 HP + 112 SpD lets you not get OHKO'd by +2 Devastating Drake, as well as avoiding the the 2HKO 100% of the time from Jolly/Adamant M-Alt. The 16 ATK evs are for a guaranteed OHKO on M-Alt w/Heavy Slam. Rest poured in defense. Made it Rest for longevity, but remember, Naganadel can set up on you and kill w/ Flamthrower after a np. Just a warning.