Author: This scene is written in Joy's perspective, and more of a filler. It does explain something that will be more important to the to-be-revealed plot, so I don't recommend skipping it. It's very short, I apologize.
"Nurse! Nurse Joy! Nurse Joy!"
The nurse turned to see her American friend Green. She was holding a very pale and injured Pikachu. It didn't seem to like being held like a child, but it obviously was too exhausted to fight. Purple and red stains dotted the front of both the trainer and her new partner.
"What seems to be the problem, Green?" asked Joy, already coming up with how to cure it. The question was rhetorical, but she answered anyway.
Green showed her the Pikachu with an attitude. She claimed, "Hater got into a fight with a Caterpie and his creepy trainer! He's badly hurt and poisoned! Do something!"
"Use this Antidote on him, I'll go get more 'serious' supplies," she said, trying to relax the panicking young girl. Nurse Joy gave her a yellow liquid in a spray bottle. The young lady fumbled with the bottle as Joy left the room and entered a door marked "医薬品".
Joy gathered a few very powerful Potions and medical supplies. She couldn't help but glance at the little lady. The air seemed to thicken whenever she caught sight of her. The state of her Pikachu. . . She had some explaining to do.
"So?" the woman asked.
"So what?"
"What happened to your friend over here?" she said, taking the yellow mouse with an attitude.
"I-I met some creepy little kid, and he 'cursed' me after Hater hurt his Caterpie. . . Some kid, right?" Green gave the most nervous laugh ever, then she saw that Joy didn't even twitch.
Nurse Joy replied, "Bug Catcher. . . Did you catch his name?"
Green shook her head.
"I'm sorry to worry you then."
"Tell me what is going on. Now," demanded Green.
Nurse Joy sighed, "It's. . . Fine. I'll tell you while I tend to your Pikachu. Haven't seen one this bad since the family that used to live in your house. That trainer was certainly something."
When I was your age, I knew someone named Mayavin. Mayavin was a genius at the time. You have no idea what he was capable of doing. His ideas included the machine that can heal Pokemon while they were still in their balls, a device that our Center doesn't have access to yet, and how to improve the Pokedex, which was pretty primitive in those times. He was Doctor Aochider's assistant for a year, but eventually had to quit so he could focus on school. But I don't blame him. He rarely left his house during that year, having to research simple language and complex Pokemon theories simultaneously."
A month after his 'retirement', he grew paranoid and creepy, questioning everyone's and everything's actions and thoughts. Mayavin claimed reality was an illusion, and that was not normal for him. Then he grew creepier, predicting pop quizzes two weeks before they were even planned by the teacher, knowing exactly when it was going to rain, time and date, and even got his father to stay home from work the day his office was ransacked by the Rocket Band."
By the time Christmas break rolled around, the kid was skipping school to sit in his room sketching horrors psychologists couldn't understand, writing in a cipher the smartest scientists couldn't crack, and sleeping. He barely ate or left his room. He slept. Mayavin then ran away from home. All that was left of him was a sketchbook found in the woods. Some investigators found his footprints, which abruptly stopped. There were no signs of murder or suicide, no bodies were found, no extra sets of footprints, nothing at all. My childhood friend, Mayavin, had vanished into thin air."
Green was silent. Wander had hopped over to the rather depressed-looking Nurse to comfort her, and even Hater, who had survived the poisoning and was apparently in condition to move about, had dropped his rude act for a while.
Joy handed her Pikachu back. "But this curse you mentioned. . . Maybe I know something he told me. . . What exactly did your 'friend' say to you?"
"I would become the Master of Pokemon, but it would be a dangerous road, and my Pokemon will suffer mortality," the girl said.
Joy's tone went from forced smiling to grimdark, "A Nuzlocke Effect. . ."
Green stared at the woman. "Nuzlocke Effect?"
"Nuzlocke Effect is a name Mayavin would give to trainers who were jinxed with bad luck, but he found no scientific explanation or cure. The effect is disastrous. Pokemon are supposedly doomed to die if they are faint in battle, and there are limitations to their abilities. I think the juvenile Bug Catcher you encountered used an incantation he found or something similar. And don't dismiss my claim as a silly joke, because I saw this before," explained Nurse Joy.
Green thanked the woman for helping her duo recover, and stepped out of the Pokemon Center. Nurse Joy waved to her, then went back to work.
But first, she couldn't help but glance at a black and white picture with a girl with two wild ponytails, a boy in a tuxedo, and some Pokemon. Writing near the bottom said:
私たちは、この旅で共有呪いは、私たちはあなたを失うが、知識を得る作った。あなたは、私たちのポケモンを忘れてはならないでしょう。。。〜喜びとイリュージョンのマスター