You can run a specially defensive set, something like Careful or Calm. Celesteela doesn't need need HP. Common moveset is usually Protect, Substitute, Heavy Slam/Flash Cannon, Leech Seed. Some run Flamethrower to hit opposing Celesteela's and Kartana.
HP Fire for Tapu Lele to OHKO Assault Vest...
Posting a completed 124 streak in super doubles using kingofmars' trick room team he used to win the VGC San Jose regional found here. http://www.smogon.com/forums/threads/vgc-17-sample-teams.3590391/ All credit goes to him for the team.
Porygon2 @ Eviolite
Correct. Pikachu, Cubone and Exeggcute don't have alolan forms so they will always evolve into their alolan form evolution in Sun/Moon. These are the only 3 that don't have alolan forms. All the other ones that do have alolan forms (Geodude, Vulpix, Grimer etc) wont evolve into their alolan form...
You can try using one of the teams posted on the Maison's leaderboard thread
A lot of good teams and discussions in that thread