Walkthrough: After the events that unfolded at Aether Paradise, Gladion will give you and Lillie a ride to Poni Island in hopes of finding the Kahuna so they can help you find the second flute. You and Lillie will be dropped off in Seafolk Village, quickly running into Captain Mina. She can't help you with finding the Kahuna, but she believes Hapu, who lives on Poni Island, can help. You will then head off to Hapu's house.
Aerodactyl
Wild Pokemon:
Fishing Pokemon (Levels 10-44): Magikarp(55%), Wailmer(40%), Dhelmise(5%)
Fishing SOS Pokemon #1 (Levels 10-44): Gyarados, Wailord, Dhelmise
Fishing SOS Pokemon #2 (Levels 10-44): Magikarp, Wailmer, Dhelmise
Fishing Bubble Spots (Levels 10-49): Magikarp(40%), Dhelmise(35%), Wailmer(25%)
Fishing Bubble Spots SOS Pokemon #1 (Levels 10-49): Gyarados, Dhelmise, Wailord
Fishing Bubble Spots SOS Pokemon #2 (Levels 10-49): Magikarp, Dhelmise, Wailmer
Trainers:
Captain Mina (During Trial) - Level 51 Mawile, Level 51 Granbull, Level 51 Ribombee
Items:
Pink Petal - Defeat Captain Mina During Her Trial
Rainbow Flower - Complete Captain Mina Trial
Fairium Z - Defeat Captain Mina Trial
Heart Scale - From Hapu After Purchasing Zumongous Z-Noodles
Magmarizer - From Man In Shop
Electirizer - From Man In Shop
Aloraichium Z - Show Veteran In Steelix Boat Alolan Raichu
Lucky Punch - From Rising Star in Steelix Boat
TM91 - Steelix Boat
Paralyze Heal - Show Woman In Southwestern Boat Magneton
Smoke Ball - Show Woman In Southwestern Boat Salazzle
Psychic Seed - Show Woman In Southwestern Boat Alolan Exeggutor
Nugget (Post Game) - Defeat Sightseer Marcus In Pokemon Center
PokeMart Items (Throughout Game Progression):
Poke Ball - Great Ball - Ultra Ball - Potion - Super Potion - Hyper Potion - Max Potion - Full Restore - Revive - Antidote - Paralyze Heal - Awakening - Burn Heal - Ice Heal - Full Heal - Escape Rope - Repel - Super Repel - Max Repel - Honey - Poke Toy - Adrenaline Orb
TM04 - TM14 - TM15 - TM22 - TM25 - TM34 - TM38 - TM52 - TM68 - TM71
Post Game
Details: After defeating the Main Story, you will be able to find the Sylveon User here during the Eevee Quest, as well as Sightseer Marcus in the Pokemon Center.
Trainers:
Sylveon User Kira - Level 54 Sylveon
Sightseer Marcus - Level 55 Exeggcute