Drain Punch Buzzwole/Bewear/Kommo-o
Giga Drain Comfey
Knock Off Everything
kinda gimmicky, but Z-tailwind Decidueye (increases crit ratio) with leaf blade & shadow claw?
Magnet Rise Nihilego?
Earth Power on Alolan Ninetales, while unlikely, would give it perfect neutral coverage along with its STABs (except for Rotom-H, Bronzong, and Shedinja, which dies to hail anyway).
Tapu Bulu seems like it has the most possibilities for improvement. I could see it learning knock off, synthesis, iron head/tail, drain punch, elemental punches, even possibly stuff like drill run or aqua tail.
