After Team Fellowship traveled miles from Vermillion City, they arrived to Pallet Town. They rested at Jeffrey and Diane's house for a night. Team Fellowship went to Professor Oak's laboratory and ranged the bell.

"Hi guys, you're here to see the professor?" it was Red who was currently one of Professor Oak's assistants and Jeffrey's former rival.

"That's what we're here for," Jeffrey replied.

"I don't think he's here. Try finding him at his house."

"Thanks."

Team Fellowship went to the professor's house and knocked the door. A brown-haired young woman wearing a white and green dress answered the door.

"Hi, is Professor Oak here?" Jeffrey asked.

"He's at home, Team Fellowship."

"Are you Daisy Oak?" Diane asked.

"Yes, I am," the young woman confirmed.

"I'm Misty."

"And I'm Brock."

"It's nice meeting you all. Come in," Daisy let Team Fellowship in.

"My older sister is also called Daisy," said Misty.

"What a coincidence," said Daisy Oak. She led Team Fellowship to Blue's room and opened the door. "Grampa, Blue, you have visitors."

"Hello Team Fellowship," said Professor Oak.

"Hi Professor Oak," said Jeffrey, Diane, Misty, and Brock in unison.

"Do me a favor and keep it down. My head is going to split open," Blue was in his bed having bandages in his arms and his forehead. He had an Eevee next to him in his bed.

"Did your Pokemon egg hatched into the Eevee?" Diane asked.

"It did," Blue replied.

"Blue, what happened to you?" Jeffrey asked.

"I was battling against a wild Pokemon out in Cerulean Cave. Then, Blastoise got sent flying and landed right on top of me. Talk about an errand of bad luck."

"What kind of Pokemon was it?"

"I'm not really sure. Something that I've never seen before."

"Then, what about your PokeDex? It should've captured an image of the Pokemon," Professor Oak asked.

"Unfortunately, I wasn't the only thing that was crushed by Blastoise. Look," Blue showed his crushed PokeDex.

"So Blue, what kind of attacks did that Pokemon used? We can use them to narrow down its type," the professor asked.

"It used Psychic and Safeguard. My attacks didn't reach it at all," Blue gave out what he remembered.

"Psychic and Safeguard? A Psychic-type perhaps?"

"Blue, are you referring to Mewtwo?" Jeffrey asked as he remembered something.

"How did you know that?"

"Jeffrey and his Pikachu had fought a Mewtwo before in a different world of Pokemon," Professor Oak spoke as if he had read Jeffrey's journals. "Do you think you can go to Cerulean Cave for me?" he asked Jeffrey.

"We'll go to Cerulean Cave and deal with Mewtwo, professor," Jeffrey confirmed.

"You guys can't, don't go!" Blue sat up on his bed.

"Blue, why would you say that?" Professor Oak asked.

"It's way too strong. The fact is that it is way beyond me means that you guys wouldn't stand a chance against it either," Blue gave out the fact.

"Brock and I won't be catching that Pokemon," said Misty.

"Pika, pika. Pika, pi," said Pikachu.

"Pikachu said that he and Jeffrey had known Mewtwo since they battled it in Western Cave. It should not be a problem for them," Gardevoir translated.

"We'll either catch or recruit Mewtwo after we take it down," said Jeffrey.

"Yeah, I suppose that you're right. Look, I've got to be honest with you. I want that Pokemon for myself. I know that if I had a Pokemon as strong as that one, I would be able to beat you in the next Pokemon League Championship. That's the reason I headed to Cerulean Cave, but then …" Blue lied back to his bed.

"The fact remains is that it is an unmistakably powerful Pokemon. We'll need to prepare for this. Okay, Team Fellowship, come to the lab with me," Professor Oak got up and began walking out with Team Fellowship.

In Professor Oak's laboratory, Jeffrey handed Professor Oak a journal, "Professor, we found this in the Pokemon Mansion in Cinnabar Island."

The professor read the journal and said, "That diary might be the notes of Dr. Fuji."

"Dr. Fuji?"

"It's an old tale now. But Dr. Fuji was once said to be the world's foremost scholar in Pokemon research. But soon after he discovered a new species of Pokemon, subjects of his studies grew darker. Research was soon dismissed," Professor Oak gave out what he knew.

"Why? What happened?" Brock asked.

"He was attempting to artificially create the powerful new Pokemon," the professor replied.

"Do you think Mr. Fuji and Dr. Fuji are one person?" Diane asked pondering.

"It is highly possible," said Professor Oak.

Team Fellowship traveled miles from Pallet Town and purchased Ultra Balls from the Pokemon Mart in Pewter City. After they passed Mt. Moon, they would have to cross a body of water in Route 4 then traveled in the direction towards Cerulean City.

"There it is, Cerulean Cave," said Diane as they were about to enter the cave that was not far from Cerulean City.

Team Fellowship entered the Cerulean Cave that was a home to tough wild Pokemon such as Golbat, Parasect, Kadabra, Onix, Machoke, Magneton, Electrode, Marowak, Haunter, Primeape, Arbok, and Sandslash. When crossing the bodies of water in Lapras' back, only wild Golbat were encountered some were weaker than the ones encountered on land and some were stronger. The Good Rod only fished out wild Magikarp, Poliwag, and Goldeen. The Super Rod this time fished out stronger wild Goldeen and Poliwag whereas the wild Gyarados, Poliwhirl, and Seaking were even stronger. The cracked boulders had more wild Graveler than wild Geodude.

Team Fellowship on Lapras' back crossed the water to an islet in the cave where there was a Pokemon that appeared like a humanoid feline. "It's Mewtwo," Jeffrey recognized the Pokemon.

"You learn much quicker than I thought. Have you come to enslave me like the boy before you?" Mewtwo asked via telepath.

"He can talk?" Diane spoke with disbelief.

"He's using psychic powers as a way to communicate," said Brock.

"He's referring to Blue," said Misty.

"We're not here to enslave you, Mewtwo. I have a proposition for you," Jeffrey was about to propose.

"Why should I listen to you? Pokemon are nothing but slaves to humans," Mewtwo demanded.

"Pika, pika, pi," said Pikachu.

"You're telling me that Pokemon and humans are friends?" Mewtwo eyed Pikachu as it understood what the Pokemon was saying.

"Pikachu."

"You think I will buy that?"

"You have a choice: join us and you will get a chance to something good in Middle-earth or stay in this cave doing nothing," said Jeffrey.

"Middle-earth? Why should I care? Do your worst, you will not taking me without a fight," Mewtwo began to fight.

"Transform," Jeffrey took Pokemon form.

"How can you be a Pokemon?" Mewtwo muttered with disbelief.

The Machop began charging at Mewtwo preparing to use Dynamic Punch, however Mewtwo stopped the attack with Psychic attack as it unleashed a powerful psychic power on Jeffrey. It was super effective and sent him flying backwards.

"Jeffrey!" Misty and Diane said in unison. Both girls ran to the Machop and helped him on his feet.

"Are you alright?" Diane asked.

"Don't worry about me," said Jeffrey. "Transform," he took human form. "Go Dragonite," Jeffrey sent out his dragon Pokemon.

Mewtwo used Safeguard protecting itself with a veil.

"Outrage," Jeffrey ordered and his Dragonite thrashed at Mewtwo with dragon power.

Mewtwo used Psychic as it unleashed powerful psychic power on Dragonite.

Dragonite thrashed at Mewtwo with dragon power the second time, however Mewtwo used Recover to regain health. After Dragonite thrashed at Mewtwo with dragon power the second time, Mewtwo finished off Dragonite with Psychic.

"Dragonite, return," Jeffrey called back his dragon Pokemon. "You did your best, take a nice long rest. You're up, Gengar," he sent out his shadow Pokemon.

Mewtwo regained health using Recover.

"Shadow Ball," Jeffrey ordered and his Gengar hurled a blob made of shadow on Mewtwo. As a result, it was super effective.

Mewtwo used Psychic as it unleashed a powerful psychic power on Gengar. It was super effective and Gengar was defeated.

"It takes more than just type advantage to take down Mewtwo," said Brock.

"Gengar, return," Jeffrey called back his defeated Pokemon. "You did your best, take a nice long rest. You're up, Ivysaur," he sent out his Grass-type Pokemon. "Vine Whip," Jeffrey ordered.

Before it could attack, Mewtwo used Psychic countering the attack. It was super effective and Ivysaur was defeated.

"Ivysaur, return," Jeffrey called back his defeated Pokemon. "You take a nice long rest. Lapras, you're up," he called upon his transport Pokemon.

Mewtwo used Recover to replenish health.

"Hydro Pump," Jeffrey ordered and Lapras blasted Mewtwo with powerful jets of water.

Mewtwo used Psychic as it unleashed powerful psychic power on Lapras and lowered its special defense slightly.

"Ice Beam," Jeffrey ordered and his Lapras fired a beam of freezing ice on Mewtwo. However, Mewtwo used Recover to regain health.

"Surf," Jeffrey had his Lapras creating a huge water wave then crashed it onto Mewtwo.

Mewtwo used Psychic as it unleashed powerful psychic power on Lapras. Lapras' ability Shell Armor prevented critical hits from being made.

"Hydro Pump," Jeffrey had Lapras blasting powerful jets of water on Mewtwo on the head creating a critical hit and Mewtwo was defeated.

"Beaten by you," Mewtwo got up weakly. "You have proven stronger than I am. I shall join you."

"We'll get you to a Pokemon Center," Jeffrey and Diane provided support to the weakened Mewtwo.

Team Fellowship got out of Cerulean Cave with Mewtwo joined the team.

Author's Note

Here's a list of Pokemon living in Cerulean Cave.

Cave:

- Lv. 61 Golbat = 10%

- Lv. 67 Kadabra = 20%

- Lv. 64 Parasect = 10%

- Lv. 52 Machoke = 10%

- Lv. 54 Onix = 5%

- Lv. 55 Magneton = 10%

- Lv. 64 Electrode = 5%

- Lv. 66 Arbok = 5%

- Lv. 66 Sandslash = 10%

- Lv. 61 Primeape = 5%

- Lv. 66 Marowak = 5%

- Lv. 67 Haunter = 5%

Surfing:

- Lv. 50 - 70 Golbat = 100%

Good Rod:

- Lv. 5 - 15 Magikarp = 20%

- Lv. 5 - 15 Poliwag = 40%

- Lv. 5 - 15 Goldeen = 40%

Super Rod:

- Lv. 40 - 60 Gyarados = 20%

- Lv. 25 - 35 Poliwag = 10%

- Lv. 40 - 60 Poliwhirl = 35%

- Lv. 25 - 35 Goldeen = 10%

- Lv. 40 - 60 Seaking = 35%

Rock Smash:

- Lv. 60 - 70 Geodude = 10%

- Lv. 50 - 70 Graveler = 90%

Special Pokemon:

- Lv. 70 Mewtwo = Only one