Alolan Ninetales- Light Clay for Aurora Veil. Pretty simple.
Raichu- Focus Sash, since it's a support and has low defenses. A Life Orb can also be used if you're using an attacking set.
Tsareena- It really depends. Personally, I would use a Choice Scarf or a Life Orb (you can't use a Life Orb on both Raichu and Tsareena, though).
Hope this helps! :)