Walkthrough: After your encounter with the Ultra Recon Squad in Tapu Village, you will eventually be tasked with first heading to the Aether House before completing your next Island Trial. As you arrive, the preschoolers will battle both you and Hau. After this, Acerola will arrive and mention that she is the next Trial Captain, and how her Trial will take place at the end of Route 14. As you leave the Aether House to do this, you will need to help Lillie deal with Team Skull.
Porygon - From Aether Foundation After RR Episode
Trainers:
Preschooler Hunter - Level 32 Elekid
Team Skull Grunt - Level 33 Drowzee
Items:
Rare Candy - From Preschooler After Yungoos Is Captured
Purple Petal - From Kahuna Nanu during Mina's Trial
PP Up - From Oranguru After Cleaning Play Room
Up-Grade - From Aether Employee After RR Episode