In the anime, Diancie had received Xerneas's blessing. These Mythical Pokémon had learned to create Sacred Diamonds through that blessing, making the bond between them exceptionally close.
Now the Red Crystal in Xiao Ran's hand had also been infused with Xerneas's Fairy Energy. The two complemented each other perfectly; nothing could have been more suitable.
The infusion continued for quite some time before gradually subsiding. Yet when Xiao Ran examined the Red Crystal in his hand, he found that, apart from its immense vitality and increasingly sacred aura, it seemed unchanged.
"Diancie's birth requires time, so I have sealed it away. Later, you may find a suitable place and activate it with Fairy Power. Then it will truly be born."
Seemingly aware of Xiao Ran's confusion, Xerneas explained.
Hearing this, he remembered that Diancie was born within an enormous Sacred Crystal. If he released the crystal's power here, Xiao Ran might not be able to get out of the Secret Realm.
"Thank you!"
Xiao Ran expressed his heartfelt gratitude. This extraordinary encounter alone would raise his strength several notches. There were probably only a handful of new students who could match him now.
"Now that a suitable candidate has been found, this Secret Realm must close. My slumber will continue for some time, and Yveltal also needs time to grow."
"When the branch in your hand begins to change, it will mean that Yveltal has matured and begun destroying the world. When that time comes, I hope you will guide my way."
Once the blessing was complete, Xerneas spoke.
"Rest assured. When the time comes, I'll set out to find Yveltal."
Xiao Ran nodded. Having accepted the blessing, he naturally had to shoulder the corresponding responsibility. And it was not just Yveltal—he also had to continue hunting down Team Rocket.