"So far, I've obtained nine Z-Crystals of different types."
"They're Flying, Fighting, Normal, Electric, Dark, Fire, Rock, Grass, and Water."
"That covers most of the usual types. I have enough for battles."
"But if I get a chance to expand my Z-Crystal collection, I'm taking it."
"I've already collected every Z-Crystal available on Akala Island."
"To get Z-Crystals of other types, I'll have to visit the other islands."
"Trouble is, Nanu, the Island Kahuna of Ula'ula Island, has a nasty disposition. He's nowhere near as easy to deal with as Hala and Olivia."
"As for Poni Island, Hapu hasn't yet earned Tapu Fini's recognition as its official Island Kahuna, so I can't undertake the Island Challenge there."
"That leaves Totem Pokémon as my only route to new Z-Crystals."
After some thought, Bai Shi decided to visit another island in search of new Z-Crystals.
Ula'ula Island lay southeast of Akala Island, while Poni Island lay west of Melemele Island.
Choosing the closer destination, Bai Shi made Ula'ula Island his next stop.
Before setting off, though, he stayed on Akala Island a few more days to practice his new Z-Moves.
Only when his Pokémon had mastered them and turned their newly acquired Grassium Z and Waterium Z into real fighting strength did Bai Shi prepare to leave for Ula'ula Island.
One day, several strange cracks abruptly appeared in the sky above Akala Island.
As if pulled apart by an invisible force, the cracks rapidly widened into mysterious, meter-wide openings of light.
From one opening fell a dark-red, mosquito-like Pokémon with bulging muscles.
It was Buzzwole, an Ultra Beast from another world.
The moment Buzzwole appeared on Akala Island, Tapu Lele, the Island Guardian, sensed its presence.
Tapu Lele rushed toward Buzzwole as fast as it could.
It intended to summon the guardians