Walkthrough: Off Route 9 is Memorial Hill, yet another Cemetery in The Alola Region. Near the end of it, you will find Team Skull actually battling some employees of The Aether Foundation. Aether will ask for your help, and then you will be asked to go to the Grand Hotel Resort from one of them after so, but not until you have finished your Grand Trial.
Wild Pokemon:
Walking (Levels 20-23): Gastly(50%), Phantump(30%), Zubat(20%)
Zygarde Cells: There are no Zygarde Cells found here.
Trainers:
Gentleman Smith - Level 23 Umbreon
Preschooler Liam - Level 21 Jigglypuff, Level 22 Ledian
Madame Sayuri - Level 23 Comfey
Punk Girl Melissa - Level 23 Ariados
Team Skull Grunt - Level 23 Raticate
Items:
Cleanse Tag - Near Preschooler Liam
Hyper Potion - Behind Trees On Ledge
Dusk Ball - Far Left Trees
Heal Powder - West Graves (Hidden)
Adrenaline Orb - Third Grave Up On Far Left (Hidden)
Revival Herb - Bushes In Back (Hidden)
Super Repel - Northwest Graves (Hidden)
Spell Tag - Northeast Graves (Hidden)