The Runaway Tapu Bulu

Xia Yan had come to Ula'ula Island to find Tapu Bulu mainly because he wanted to learn the origin of the Black Crystal from it.

He had thought he already valued the Black Crystal highly enough, believing it to be part of Necrozma's body.

Yet Tapu Bulu had still given him a "surprise."

The Black Crystal was actually Cosmog's true sleeping form.

With Tapu Bulu's help,

Cosmog returned to its original appearance.

Although it was still asleep, and no one knew when it would wake,

at least the worry in Xia Yan's heart had lessened considerably.

The unknown was what worried people most.

Now that Xia Yan knew Cosmog's origins, he was not generous enough to hand Cosmog over to the Pokémon League for research.

Even if

studying Cosmog could very likely allow the Pokémon League and the Aether Foundation to make tremendous progress in researching Ultra Beasts, Ultra Space, and even Ultra Aura.

Xia Yan still had no intention of letting anyone else know.

Something like a golden lion

was naturally better kept for himself to ride.

Besides asking about the Black Crystal, Xia Yan had another purpose: having Tapu Bulu help with special training.

Among the four island guardians, only Tapu Bulu had such a "hobby."

And

Tapu Bulu's special training was quite interesting.

It would not teach battle tactics or methods.

Nor would it teach moves.

It taught Pokémon how to better control their own energy.

How to better understand themselves and gain an accurate sense of their own capabilities.

It was precisely because of its help that Ash's Lycanroc, which had often gone berserk in the original story, had eventually been able to control its will and emotions.

Whether it was energy usage or understanding their own abilities and willpower, all of it was a great