It's just down this passageway, but at the end of it there's not one Klefki. There's several. Waiting for him. As soon as they see him they start dancing in the air about him excitedly. Like each one wants him to pick them.

"I cannot take all of you! Just one!"

"Klllllefffff..," they all say sadly.

"I am sorry. But. There are other good trainers to be found."

"Kleffff?"

"Yes. Until then, though, only one of you may come."

At that they cluster together, as though to deliberate.

Then they separate.

One floats forward.

"Klleffffff?"

"You wish to come with me?"

"Klef! Ki! Klef klef klef ki!"

"Alright. You may come."