After you defeat Guzma in the Shady House, you rush to help Lillie in Aether Paradise.

Go to the Elevator

If you need to, you can talk to the girl near the boat to go back to Malie City and prepare.

North of the boat, you can battle an Aether Foundation Employee who has a level 40 Alolan Dugtrio and a level 40 Toucannon. You get 1920 Pokédollars for winning.

To the northeast, you can battle an Aether Foundation Employee who has a level 40 Kecleon and a level 40 Stoutland. You get 1920 Pokédollars for winning.

North of her, you can battle an Aether Foundation Employee who has a level 40 Arbok and a level 40 Lurantis. You get 1920 Pokédollars for winning.

North the elevator, you can battle an Aether Foundation Employee who has a level 40 Parasect, a level 40 Sudowoodo, and a level 40 Drifblim. You get 1920 Pokédollars for winning.

To the north, there is a Rare Candy.

Southwest of the elevator, you can battle an Aether Foundation Employee who has a level 40 Primeape. You get 1920 Pokédollars for winning.

South of that, you will find an X Sp. Atk.

West of there, you can battle an Aether Foundation Employee who has a level 41 Arcanine. You get 1968 Pokédollars for winning.

Go southwest from there to find TM06 Toxic.

Go back to the elevator. When you approach the control panel of the elevator, a cutscene occurs. You will have to battle Aether Branch Chief Faba. He has a level 43 Hypno. You get 5160 Pokédollars for winning.

Afterward, Faba will enter the code for the elevator, and Gladion will ask if you are ready. If you are, say Yes.

Hau gives you a Max Revive.

You can ride the elevator back to the docks at B1F if you missed anything there earlier or if you want to take the boat back to Malie City. Then when you come back to Aether Foundation, use the elevator to go back to B2F.

Examine the Secret Lab

Go east from the elevator and go through the door there. Then go east to approach the people who are wearing helmets. You will battle an Aether Foundation Employee who has a level 41 Alolan Muk. You get 1968 Pokédollars for winning.

After that, you battle an Aether Foundation Employee who has a level 41 Magneton. You get 1968 Pokédollars for winning.

Then you have to battle another Aether Foundation Employee. This one has a level 41 Porygon2. You get 1968 Pokédollars for winning.

After a cutscene, go east. You can talk to Gladion if you wish. Then go east and go through the door at the end.

You and Hau will have a double battle with two Aether Foundation Employees. They have a level 41 Huntail and a level 41 Gorebyss. Hau sends out his level 42 Raichu. You get 3936 Pokédollars for winning.

Afterward, read the book on the shelf in the upper-right corner, and you can read the computer in the bottom-right corner. Then leave the room.

After a cutscene, go west. You can go into Secret Lab A. Nobody is in there, and you can read some interesting files on the bookshelf. You can also read some things on the computer.

To the right of the computer, there is a Full Restore.

Now leave the room and go west to reach the elevator. Go up to 1F Entrance. Hau and Gladion will join you. Then you and Hau have to battle two Aether Foundation Employees. They have a level 41 Lileep and a level 41 Anorith. Hau sends out his level 42 Raichu. You get 3936 Pokédollars for winning.

Afterward, Wicke heals your pokémon.

You can go south and use a PC on the desk on the left if you want to switch out your pokémon.

Reach Lusamine

When you are ready, go north. You and Gladion will have a double battle with two Aether Foundation Employees. They have a level 42 Electabuzz, a level 42 Magmar, a level 42 Houndoom, and a level 42 Manectric. Gladion sends out his level 44 Type: Null. You get 4032 Pokédollars for winning.

After that, you and Hau have a double battle with an Aether Foundation Employee, and Aether Branch Chief Faba. The Aether Foundation Employee has a level 42 Ledian and a level 42 Pupitar, while Faba has a level 44 Claydol, a level 44 Bruxish, and a level 45 Hypno. Hau sends out his Raichu, followed by his level 42 Noivern, then his level 42 Vaporeon. You get 7416 Pokédollars for winning.

After the battle, you can once again go south to use the PC to switch out pokémon if you wish.

Then go north to go outside.

After a cutscene, go west, then south, to find a Full Heal. Then go back to where Hau is, and go east from there, then south, to find another Full Heal.

Go north and you have to battle a Team Skull Grunt who has a level 42 Golbat. You get 1344 Pokédollars for winning.

Then go north and you have to battle a Team Skull Grunt who has a level 42 Raticate. You get 1344 Pokédollars for winning.

Go north and the third Grunt won't battle you. Go north and you have to battle Team Skull Boss Guzma. He has a level 45 Golisopod, a level 45 Pinsir, a level 45 Vikavolt, and a level 45 Masquerain. You get 5400 Pokédollars for winning.

Afterward, you can once again go south to use the PC or talk to the employee next to the PC to have your pokémon healed up.

Then go north and go through the doors of the mansion. You have to battle Ultra Recon Squad Dulse (in Ultra Sun) or Ultra Recon Squad Soliera (in Ultra Moon), who has a level 47 Poipole. You get 564 Pokédollars for winning.

Then go north through the doors.

Battle Lusamine

After the cutscene, go north and walk into the glowing rings. After a long cutscene, you must battle Aether President Lusamine. She has a level 47 Clefable, a level 47 Lopunny, a level 47 Bewear, a level 47 Milotic, and a level 47 Lilligant. You get 11280 Pokédollars for winning.

After the cutscene, go south to leave the room, then go south to go outside, and go south to start another cutscene. If you are playing Pokémon Ultra Sun, you will receive the Moon Flute. If you are playing Pokémon Ultra Moon, you will receive the Sun Flute. You also get a Master Ball.

Go south to enter the main building. Talk to the guy to the right of the door to get a Stick.

If you go south through the building to the outside, go west to find a Heal Ball.

To the east of the building, there is a Hyper Potion.

If you are ready, go back inside and take the elevator down to B1F. Go southwest and talk to Gladion, and say Yes if you are ready to go. You'll arrive in Seafolk Village on Poni Island.