After meeting with Lillie in the Malie City Library, you go to Route 10 on your way to your next trial.
Explore Route 10
The woman near the entrance of Route 10 asks you to find her Stufful in the route. Just talk to one if you find one. After you find all of them, go back and talk to the woman to get a Never-Melt Ice and 15000 Pokédollars.
There is a hidden Lemonade south of the woman, on a rock next to a stalk of bamboo.
North of that, there is a Black Belt looking at a shaking tree. If you approach the tree, a pokémon will come out and battle you, and you can try to catch it if you wish.
To the left, you can battle Firefighter Alex. He has a level 28 Poliwhirl. You get 1120 Pokédollars for winning.
One of the missing Stufful is south of the firefighter, in front of some plants.
Northwest of the firefighter, there is a Paralyze Heal.
To the left of this, you will find one of the missing Stufful.
If you go south of this tree, the tree will start shaking, and if you approach it, a pokémon will come out.
There is a hidden Tiny Mushroom south of the shaking tree.
To the north, there is a palm tree with berries in front of it. One of the missing Stufful is behind this palm tree.
If you check on the berries, a pokémon might be hidden underneath.
The girl to the left will heal up your pokémon if they need it.
Farther to the left, there is a shaking tree. One of the missing Stufful is north of the tree.
Southwest of that, you can battle Beauty Andrea. She has a level 27 Steenee. You get 864 Pokédollars for winning.
Northwest of the Beauty, there is an X Accuracy in the grass.
One of the missing Stufful is in the grass to the right.
If you go northeast across the dirt path, you will find one of the missing Stufful behind the Trainer Tips sign.
Farther along the path, there is a Stufful to the left.
To the right, you can battle Police Officer Mitchell who is walking around in the grass. He has a level 28 Growlithe. You get 1120 Pokédollars for winning.
There is also a missing Stufful in the grass near the Officer. Be sure to go back and talk to the woman at the east side of the route to get your reward for finding all the Stufful.
Up ahead, you find two Team Skull Grunts gesturing at the bus stop sign. Approach them and you will have to battle a Team Skull Grunt that has a level 27 Golbat. You get 864 Pokédollars for winning.
After that, you have to battle the other Team Skull Grunt. This one has a level 27 Raticate. You get 864 Pokédollars for winning.
After you win, the Grunts give up and go back to the Team Skull mansion. Then Professor Kukui arrives and waits at the bus stop.
Check on the bus stop sign and, if you are ready, say Yes when asked if you want to wait and catch the bus. You will go to the top of Mount Hokulani.