Walkthrough: Right off Route 16 is Ula'ula Meadow. This is a small path with more Trainers than Wild Pokemon, and it leads you straight to Route 17 where Po Town can be found.
Wild Pokemon:
Grasses - Daytime (Levels 31-34): Cottonee(30%), Ribombee(30%), Ledian(20%), Oricorio(20%)
Grasses - Nighttime (Levels 31-34): Cottonee(30%), Ribombee(30%), Ariados(20%), Oricorio(20%)
Zygarde Cells: There are two Zygarde Cells found here.
Trainers:
Dancer Mireille - Level 34 Oricorio
Lass Rylee - Level 33 Sneasel, Level 34 Komala
Office Worker Michelle - Level 33 Torkoal, Level 33 Seaking, Level 34 Leafeon
Golder Dean - Level 34 Hariyama, Level 34 Alakazam
Items:
Red Nectar - Flowers Near Dancer Mireille
Repeat Ball - East of Dancer Mireille
X Sp.Def - Northwest Grave
Adrenaline Orb - Far Northwest
Flame Orb - Defeat Golfer Dean