Walkthrough: After defeating Team Skull in your first encounter, you will then earn access to Route 2, the entrance of which can be found in the far northwest corner of Hau'oli City. After managing to get on Route 2, however, you'll most likely be drawn to taking the path off to the right then going straight on Route 2. This path will lead you to the Hau'oli Cemetery, where trainers and wild Pokemon can be found.
Wild Pokemon:
Wild Grasses - Daytime (Levels 7-10): Gastly(50%), Drifloon(30%), Zubat(20%)
Wild Grasses - Nighttime (Levels 7-10): Gastly(50%), Misdreavus(30%), Zubat(20%)
Zygarde Cells: There is one Zygarde Cell found in the Cemetery.
Trainers:
Gentleman Stanley - Level 9 Makuhita
Pokemon Breeder Ikue - Level 9 Pikachu
Office Worker Jeremy - Level 9 Diglett
Items:
Paralyze Heal - Southwest Corner
Super Potion - Northwest Corner
Big Mushroom - Southeast of Office Worker Jeremy
TM56 Fling - From Machamp Woman At Night
TM100 Confide - Northeast Corner
Spooky Plate - Near Cave (Hidden)
Ether - Middle of Path (Hidden)
Great Ball - Near Lamp Post (Hidden)
Post-Storyline
Details: After defeating the main Storyline, you will find the Umbreon User in the Cemetery for your Eevee Quest.
Trainers:
Umbreon User Braiden - Level 55 Umbreon