Inside the Tree of Creation.
Through Li Wei's conversation with Mew, they learned that
Mew's roaming range was actually quite limited.
It could only travel as far as the Tree of Creation's underground roots extended-specifically, wherever there were Energy Crystals.
Cameran Palace had Energy Crystals, so Mew could go there.
That was why the collapse of the Tree of Creation would also throw Cameran Palace into chaos.
Li Wei cautioned, "Mew, you can't just bring Pokémon in here anymore. Other Trainers are bound to enter the Tree of Creation like we did."
Mew nodded vigorously. "Mew!"
Nothing like this had happened before, so Mew had never realized it could happen.
Now that Mew knew, it naturally wouldn't casually bring Trainers' Pokémon inside anymore.
They spent some time playing with Mew, including Shaymin's favorite game of hide-and-seek.
Lucario simply leaned against the crystal that held Sir Aaron's final moments, clutching Sir Aaron's gloves.
Li Wei's Lucario sat beside Lucario without a word, offering quiet company.
It was almost time for Li Wei and the others to leave.
Ash faced Lucario and extended a heartfelt invitation.
"Lucario, would you like to travel with me?"
Ash's smile was genuine, full of sincerity.
Ash was a wonderful person, but he wasn't Sir Aaron.
Lucario shook its head. "Ash, I want to stay here, protect Her Majesty Arianna, and keep Mew company."
Lucario wanted to fulfill its promise to Sir Aaron and protect Cameran Palace.
Sir Aaron had already fulfilled that promise with his life. As his student and comrade, Lucario naturally couldn't fall behind.
As a Pokémon, Lucario wouldn't be treated as a virus when it entered the Tree of Creation.
Mew also often visited Cameran Palace to play.
By staying at Cameran Palace, Lucario could play with Mew and keep it from