Serena was on an  aeroplane to Kanto to see her best friend, Ash Ketchum. It has been  10 years since her last visit.

  The aeroplane landed at Kanto Airport. Serena breathed in the fresh Kanto air.

 "Ahh, its nice to be here again.  Right..."  She tossed one of her pokeballs and a fox-like figure came out. "...Delphox? "

 " Delphox! " It agreed. Serena had trained Braixen to be the very best and so Braixen evolved into an all new Delphox.

 "Serena!!!" A familiar voice called.

 "Ash? Is that you?" Serena asked, the figure coming closer.
But it was not Ash, it was Delia,  his mother.

 "Mrs. Ketchum! Long time no see!" Serena greeted.

 "Del delphox!" Delphox did the same.

 "Same to you too! And my,  your  Braixen had evolved! It looks as beautiful as you, Serena!  " Delia said, amazed.

 "Delphox!" Delphox twirled around. This action made Delia giggled.

 "Come on, let's go!" Delia said then ran to the car, Serena following.

 Serena and Delphox hopped in the car, and Delia drove them to her house.

 There, Delia's Mr. Mime was gardening. "Hello, Mimey! Say hello to our guest, Serena!" Delia said as Serena got out of the car.

 "Mime!" Mr. Mime greeted.

 "Nice to meet you too, Mimey. " Serena said.

 "Ash! I'm here!" Serena called out.

 "Guess that boy is still doing his errands." Delia sweat drops.

 Serena falls, Delphox doing the same. "And to think we both came here to visit him as soon as we got here. Same old Ash I see. " Serena sighed.

 "Delphox..." Delphox agreed.

 "Meanwhile, why don't you take a look around Pallet Town? You can visit Professor Oak too! " Delia suggested.

 "Alright, Mrs. Ketchum! " Serena said then dashed off with Delphox following her.

"Oh! Delphox, return! " Serena said and Delphox returned to its pokeball.

 Serena knocked on the Pokemon Lab's door. " Hello? Professor Oak? " She asked but there was no reply.

 She opened the door slowly and saw a machine. It was as big as a snorlax!

 "Holy Arceus, what's this? " She asked herself. She saw a note attached to the machine. It said:

 'Got to go buy some items to complete the machine. Be back soon and don't touch it.

                                                                                                                                                                     -Professor Oak.'

 Serena read the note again and again and examined the machine.

" Looks so...weird. " She said. There was a door in front of it.

" I wonder what's inside? " She asked curiously. She slowly opened the door and peeked in.

She got sucked by the machine and the door closed.

 " Hey! Let me out!!! " She shouted, banging the door with her fists. Some fog appeared and surrounded her.

 She coughed and everything went black. A few hours later, Professor Oak came back with some items to work on the machine.

 He opened the door. " Serena? What were you doing in there? "   Professor Oak asked,  concerned.

" Huh? " Serena was confused.

 " Huh? " A voice behind her said. It went on and on until the 5th person said 'huh?'.

 " Oh great! My machine worked! It was supposed to work on Pokemon, not humans!" Professor Oak panicked. 

" Slow down, professor! Just chill! " One of the Serenas said. She had dark blue eyes instead of her regular light blue ones.

" And I even separate their personality! You must be the kuudere one!" Professor Oak said. 

 " Yup! " She said.

 " Great job, Oak Tree! You messed up! "  Another Serena said. She had orange eyes.

 " You're the sassy one... " Professor Oak said.

 " You know it!" She put her hands on her hips.

  " I-I'm sorry, i-it's all my fault..."  Another Serena said, tearing up. She had deep grey eyes.

 " No, its okay Serena. You must be the timid and shy one.  " Professor Oak said.

 " And you know who I am, Oaky~ " A purple-eyed Serena said.

 " Flirty Serena..." Professor Oak said.

 " Where's Ash? I bet that boy is dating with that pest Misty! " Another Serena said, holding a knife. She had red eyes.

 " What Serena are you supposed to be? " Professor Oak asked.

 " Who am I? " She placed a knife near Professor Oak's neck. " Who am I!? "

 " I'm Yandere Serena. Just so you know, Ash is mine. Only mine. " She said darkly as she pulled away her knife from the professor's neck.

 " Okay, that's all five. Arceus how can I fix this? " Professor Oak asked.

 " Oh I don't know, maybe ask for help rather than standing here like a lonely person!? " Sassy Serena said.

 " Calm down, Sass. " Kuudere Serena said.

 Suddenly, the door burst open. There was a figure standing there. A raven-haired boy with a Pikachu on his shoulder. It was none other than Ash Ketchum.

  " Professor, I heard that-- " He was shocked to see the five Serenas. " Serena? " He asked, just to make sure he wasn't dreaming.

  " Yes? " All of them answered.

 " Wow Ash, you look cute today. " Flirty said and winked at him, making Yandere Serena  angry.

 " Back off, he's mine! " She said, holding her knife.

 " Easy with the knife, Serena. " Ash said.

 " Anything for you, sweetie. " She said innocently then kept her knife.

 " Prof, what's going on? " Ash asked.

 " Well, when I got here, Serena was in this duplicate machine. I don't even know each of them represents Serena's personality." Professor Oak said.

 " Of course you don't. " Sass rolled her eyes.

 " And how can you fix it? " Ash asked.

 " By doing this. " Flirty Serena said then kissed Ash. He was blushing like crazy.

 " Flirty...." Yandere Serena held her knife. " I'll kill you! " She shouted and tried to stab flirty.

 Flirty dodged all of the attacks swiftly. " Is that all you got? " She asked.

 Yandere Serena was about to go for another attack until someone tugged her shirt. It was Kuudere Serena.

 "Girl, calm down. Your boyfriend is right in front of you. " She said and tilted her head at Ash who was still blushing from the kiss.

 Yandere Serena calmed down and tried to forget what just happened.

 " So Ash, you're still aiming to be a Pokemon master after all your failed attempts? " Sass asked.

 " Yeah, I learned from my mistakes and never give up! " Ash said happily while giving some items to Professor Oak.

 "Heh, you have good spirit, Ash. " Sass said with a smirk then ruffled the boy's hair.

 " Thank you, Sass. " Ash said.

 " A-Ash, I-i'm very sorry if I had done something wrong to you... " Timid  said.

 "Its okay, Timid. Everyone makes mistakes. " Ash said reassuringly. Timid smiled weakly.

 "So Ash, how are you and Misty doing? " Kuudere Serena asked.

 " Nothing much. She's too busy at the gym though. " Ash said.

 " Good, good. " Kuudere Serena said.

 "So, Ash..." Flirty began.

 " Yeah? " Ash said, looking up to see the five Serenas.

 "Who would you choose? " The five of them said in unison.

 " What do you mean? " Ash asked, oblivious.

 " To be your girlfriend, silly! " Kuudere Serena said.

 " Uh-uh... " Ash stammered, sweating.

 " Come on, Ashy boy..." Flirty Serena said.

 " Choosing is not THAT hard, Ash. " Sass said.

  Flirt, Sass and Kuudere pulled Ash's right hand while Yandere and Timid pulled the other hand.

 " Choose already! " Yandere Serena said. 

  It began to be a game of tug of war, or in this case, tug of Ash. 

 " Girls, please stop pulling me. " Ash said, annoyed.

 " Ch-Choose! " Timid said next. 

 " ARGH, JUST STOP!!! " Ash shouted, making the five Serenas release his hands.

 " I choose the original Serena. Not any of you! " Ash said.

 " A-Ash... " Timid said, sobbing. Ash could tell that she was heartbroken.

 " I'm very sorry, Timid. I liked the real Serena. Who always cared about me like Flirty. Who always calmed me down like Kuudere. Who always had a sassy attitude and timidness. Yandere... you are also a part of Serena and I appreciate that. "
Ash said.

 " Aww Ash... " Four of them hugged the raven-haired boy but Yandere backed away.

 " Come on, Yandere! There's room for you too! " Kuudere called out.

 " It's okay, I don't need comfort. " Yandere looked at the floor. She closed her eyes and breathed. 

  Suddenly, she heard footsteps coming towards her. She didn't get a chance to look up. A pair of arms wrapped around her and she was embraced in a hug. Who hugged her? The figure released the hug and looked Yandere in the eyes. It was Ash. 

 " All done! " Professor Oak exclaimed.

 " Guess its time to go..." Kuudere said. She looked at Yandere and Ash.

 " Sorry to spoil your little moment, but we have to go. "  Sass said, impatient.

 " Goodbye Ash. " Yandere kissed Ash. " You're always in my heart. "

  Ash smiled. 

 The five went inside the machine. Professor Oak pushed a button and mist filled the machine. 

 " We'll miss you, Ash! " The five said.

 " I'll miss you guys, too! " Ash said and waved at them.

 Once the mist cleared, the door opened, revealing Serena. The original Serena.

 She ran towards Ash and hugged him . "A-Ash..." She said.

 " Its alright... I'm here. " Ash hugged back.

  They both said goodbye to Professor Oak and they went to Ash's house. They talked for a while.

 " Sass didn't cause any trouble, did she? " Serena asked.

 " Not at all. Speaking of Sass, why were you so sassy to Miette in the kalos region? You know, the blue haired girl? " Ash asked.

 " Miette? I have a bad memory, could you give me more information about her? " Serena asked.

 " She's the one who danced with me at the dance party. You danced with Clemont that time, don't you remember? " Ash asked.  

 " I do now! " Serena exclaimed.

 " Why are you sassy around her? " Ash asked.

 " Um... U-um... no reason? " Serena answered.

 " Okay then, I guess. " They stopped to see that they were already in front of Ash's house.

 " Come on in, Serena. " Ash said and walked in, Serena following behind him.

 " Where were you, Ash and Serena? " Delia asked worriedly.

 " Well, it all started when... " Serena began.

 And so, Serena was back to normal. 

             THE END....
~~~~~~~~~~~~~~~~~

Hooray! My first One-shot done! This is actually based on the song Ten-faced, a vocaloid song and that one episode from Teen Titans when Raven separated her personalities( I think it was either episode 7 or 8).

Welp, hope you enjoy and goodbye!