I'm wondering if I should continue the series. Let me know in the comments. DISCLAIMER I don't own Pokemon.
In Santalune City...
"So you're going to complete the Pokedex? Keep in mind that's not an easy feat." Calem noted.
"I know. I'll have to do a lot of backtracking." Ash agreed.
The group was in Santalune City after Ash had become the champion of Kalos the previous day.
"Can we go back to Pokemon Village one more time before we start?" Bonnie asked.
"Well...we never did get to completely explore it," Serena noted.
"I'm up for it. Plus, you can catch more Pokemon there!" Calem pointed out.
"All right then! But I need to get some Ultra Balls from the PokeMart first." Ash said before running away.
In Pokemon Village...
"Well, here we are! Bonnie, you can explore. I'm going to catch some Pokemon." Ash said before searching for Pokemon. He encountered a Bannette in a trash can, a Gothita, Ditto, Furfrou, Garbodor, and Sneasel and put them all in his PokeDex. Bonnie, Serena, and her Pokemon played with the Pokemon hiding in the grass while Clemont and Calem examined the Pokemon for future inventions. Meanwhile, Ash caught a red Gyarados, a Carvanha, a Sharpedo, and a Basculin in the nearby lake. Finally, he entered the cave. In it, he found a Pokemon with its back turned. Ash gasped, instantly knowing who it was. The gasp got the Pokemon's attention.
"Well, well, well. If it isn't Ash. Nice to see you again."
"Mewtwo?! What are you doing here?"
"This is where I went after our little...mishap in Kanto with Giovanni. You could call this my second home. What are you doing here?"
"Well...I just became champion, and I'm going to complete the PokeDex."
"Hmmm...so I presume you have to catch me."
"I guess so..."
"I'm not so easy to catch. Only one person has caught me before."
"ONE?!"
"Correct. However, I don't mind letting you attempt to catch me. Let's begin."
"All right! GRENINJA, I CHOOSE YOU!"
"A Kalos starter. I expected a Kanto starter like Charizard. No matter."
Mewtwo used Psychic and slammed Greninja on the ground.
"Greninja, Feint Attack!"
Greninja landed the attack, but Mewtwo wasn't finished. He used another Psychic, but Greninja broke free.
"Great, Greninja! Feint Attack again!"
Mewtwo was hit once again, and was close to fainting. Ash pulled out an Ultra Ball and threw it at Mewtwo, only for Mewtwo to instantly break out of it.
"I told you, I'm not that easy to catch."
Mewtwo then used Recover, which put him almost at full health.
"ASH!" Calem ran inside the cave. He stopped when he saw the Pokemon he was battling.
"WHO IS THAT?!"
"Ah, the former champion. Why don't you watch your friend as he attempts to catch me?"
"HE CAN TALK?!"
"Calem, calm down. This is Mewtwo. I met him in Kanto."
"He looks like a legendary...are you really trying to catch him?"
"Yes! This is a giant step to completing the PokeDex!"
Calem put his hands in his pocket.
"Fine. I guess I'll watch! But be careful! Legendaries have a 0.4% catch rate, making it nearly impossible to catch!"
"He's a knowledgable one."
"Where were we? Oh right! Feint Attack!"
The attack landed, quickly getting rid of the recovered health Mewtwo gained. Again, Mewtwo was low on health. Ash threw another Ultra Ball. This time, it shook twice, but Mewtwo broke free again.
"Close. But it's time to kick it up a notch."
Now, Mewtwo used Psystrike and aimed it straight at Greninja.
"DODGE!"
The Psystrike missed and obliterated a nearby wall. Ash took out another Ultra Ball.
"I can do this." He thought. Greninja stopped running and awaited his trainer's command.
"Greninja, Water Shuriken!"
The attack hit, hurting Mewtwo, but just enough so it could still be caught. Mewtwo was panting. Ash threw the Ultra Ball once more. One...two...three! Mewtwo was caught.
"I..did it! I did it! I CAUGHT A LEGENDARY!"
Calem ran up. "That was fantastic! I was sure that would take a while! Looks like I was wrong."
Ash threw Mewtwo's PokeBall and Mewtwo appeared.
"You're the second trainer who's caught me."
Mewtwo smiled.
"However, knowing you, I'm sure that you won't use me for evil."
"You're right!"
Ash noticed something sparkling near Mewtwo's feet. Mewtwo followed his gaze and picked up the object. He gave it to Ash.
"This stone allows me to Mega-Evolve. You may want to keep that just in case."
"Which one?"
"What do you mean?"
"Back in Unova, I saw you Mega-Evolve into Mega Mewtwo Y. Remember Genesect?"
"The Genesect I battled was different from normal Genesects. It was a different color..."
"Maybe I can explain," Calem interrupted. "That was probably a shiny."
"A shiny?"
Ash took over, as Calem explained it to him when caught the red Gyarados.
"A shiny is a Pokemon with a color different than it's normal color. There's a 1 in 8000-something chance you'll find one!"
"It was strong, so if you catch it, it will definitely be useful to you. Anyway, this is my Y stone. Take it."
Ash took the stone and returned Mewtwo to its PokeBall. They left the cave and found their friends near the entrance.
"Ash, it's getting dark out. Maybe we should head to the Pokemon Center." Clemont said.
"Maybe you're right."
With that, the company exited the Pokemon Village and headed towards the Pokemon Center.
Two weeks later...
Ash, Clemont, Bonnie, and Serena took the elevator to Professor Sycamore's room.
"Why, hello! Congratulations on becoming the champion!"
"Thanks, Professor!"
"To what do I owe this visit?"
"I came to show you my PokeDex."
Ash handed him his now complete Kalos Pokedex. The Professor grinned from ear to ear and reached into his pocket.
"That's amazing! Thank you so much for your help! In return, I have a gift for you."
He held up a necklace with an oval on it.
"This is the Oval Charm. If you have Pokemon in the daycare, this increases the chance of finding an egg."
"Wow, thank you!"
"Now, let me give you another challenge."
He took his Pokedex and a few minutes later, he returned it. Ash looked and saw a new feature called the National PokeDex. He saw he had captured about 300 Pokemon out of 722.
"WHOA! 722 Pokemon?!"
"That's right! You have to go from region to region to get some of these Pokemon. Some can also be accessed by breeding, fishing, and horde encounters! I'd say the legendaries are the toughest to catch."
"But...where do I start?"
Professor Sycamore handed him a newspaper. Ash read the headlines: MYSTERIOUS RINGS FOUND IN THE HOENN REGION! FOREIGN POKEMON APPEAR!
"Back to Hoenn, huh? Well, I know some friends who can help me there!"
"OK! When you're done, come back and I'll give you another gift. I'll contact a special friend to meet you at the train station."
"So...you're leaving?" Bonnie asked in tears.
"I have to. I can't complete the PokeDex only in Kalos."
"Then we'll see you off!" Clemont said. Serena was pretty close to tears herself.
They left the Pokemon Lab and headed towards the train station. A train from the Hoenn region arrived.
"So, I guess this is it." Ash said sadly.
"Yeah..." Serena said.
"Please don't leave, Ash! Please!" Bonnie said with tears streaming down her face. Ash kneeled down to her. I have something for you to remember me by. Ash gave her a PokeBall. Bonnie threw it and a white Eevee appeared.
"Thanks, Ash. I'll still miss you though." Bonnie threw her arms around Ash's neck. "You're like the brother I've never had..." Ash hugged her back and shook Clemont's hand.
"You've taught me so much...thank you!" Clemont said.
"So did you! Science truly is amazing!" Ash responded.
Finally, Ash stopped in front of Serena. Her eyes glistened with tears, as she prepared to say goodbye.
"Serena, I want you to join me in Hoenn."
This came as a complete surprise to Serena. She was tongue-tied.
"If you don't want to, I understand."
She smiled.
"Honestly, I'd love to. But I still have to become Kalos Queen..."
"Ok. You're really close! You can do it!"
"I'll catch up with you, though. I promise!"
"When is the performance against Aria?"
"Next week! I have to practice if I have any chance of winning."
They shared one last kiss and Pikachu jumped on his shoulder.
"Good luck! Maybe I'll become Champion of Hoenn too! I don't know."
"Go for it, Ash!" Serena encouraged.
"You can do it!" Clemont agreed.
"Thanks!"
They stepped on the train and found a seat. As the train left, Serena, Bonnie, and Clemont waved goodbye. Ash returned the wave and looked at his passenger.
"You must be Ash!"
The man had light-green hair and wore a suit with a Key Stone.
"Professor Sycamore told me about you. My name's Steven. It's nice to sit with a fellow champion."
"You're the Hoenn champion?"
"That's right!"
Ash smiled.
"Well, I may be coming for your title soon."
Steven returned the smile.
"Well, I'd be glad to battle you for it."
Ash laid back as the train took him from Kalos back to Hoenn, where a new adventure awaited him.
THE END