Melemele Island, Pokémon School.
Ash had arrived at school and was sharing what he had seen with Kiawe, Lillie, and his other classmates.
He also wanted their help figuring out why something was happening.
"I don't know why, but these past two days, Professor Kukui and I have kept seeing Rockruff come home covered in injuries."
"Huh? Why?"
"Are the injuries serious?"
Lillie and Mallow pressed him for details.
"Not really. The professor has already treated them."
Seeing Li Wei appear in the doorway, Lana asked, "Mr. Li Wei, do you know why?"
At Li Wei's arrival, Ash and the others immediately turned their eyes toward him.
"If Rockruff came back covered in injuries, it must have been battling."
"The injuries weren't serious, right?"
"No, a spray of Potion took care of them."
Li Wei asked another question. "Then Rockruff went out again the next day and came back covered in injuries again?"
Ash looked at Li Wei with admiration and nodded vigorously. "Yes, yes, yes!!! Mr. Li Wei, how did you know?"
Li Wei nodded. "I have a pretty good idea of what's going on. It's nothing serious."
There was probably a battle venue exclusively for wild Pokémon, much like the ones in Professor Oak's backyard and his own Theme Park.
As the saying went, once people had full bellies and warm clothes, their minds wandered.
In plain terms, they had eaten their fill and had nothing better to do.
Some Pokémon also had a stronger desire to battle. They would organize battles on their own, eventually forming groups like these.
The battle venue on Professor Oak's back mountain had actually been organized by Blue's Pokémon.
The battle venue in the Theme Park, meanwhile, had been organized by Lucario, Zeraora, and Metagross.
Li Wei reckoned that a similar venue