Zephyr Heights castle 9:00pm

In the castle of Zephyr Heights, the mane five, Sylveon, Hydro Petals, Greninja and Queen Haven were seen gathered in the throne room with Queen Haven, Princess Zipp, Pipp, Prince Hydro Petals and Prince Greninja sitting on their thrones looking down at Braixen who was cuffed in her arms and legs, her fire stick was confiscated too. Then, Queen Haven began to give Braixen her sentence.

"Braixen, the fire fox Pokemon and the leader of the Pokemon crew who attacked Maretime Bay, Bridlewood and Zephyr Heights as well as injuring many poor citizens in those three cities too." Queen Haven stated with an angry expression. "For your crimes against pony kind, I hereby sentence you to life in the dungeons. Guards! Escort this barbaric fire fox Pokemon to the dungeons now where she will spend her lifetime with the others." She ordered which made Braixen's eyes widen in horror.

"Wait, no you can't!" Braixen exclaimed but, the guards beagn to escort her to the dungeons where she will pay for her crimes. "You can't arrest me! I'm a popular performer from the Kalos region! Greninja! Sylveon! Help me please!" She pleaded.

"Sorry Braixen, you brought this upon to yourself." Greninja told her.

"You ruined your own reputation Braixen." Sylveon said shooting Braixen a glare.

Braixen tried to struggle free but, one of the guards punched her across the face, ceasing on her attempt. Then, they all began to drag her to the dungeons.

Once the entire ordeal was finished, Greninja placed his right hoof on his head, he couldn't help but feel bad for Braixen, she was his first lover after all since she was a Fenniken and when he was a Froakie but, she did the crimes against the ponies he cares about, now, she must face the repercussions.

"Are you okay dad?" Hydro asked hugging his dad in order to relieve his stress.

"I'm fine champ." Greninja said with a chuckle patting his son on his head. "Besides, I'm very proud for your dedication in protecting the ponies with bravery and wisdom." He told him in a proud tone.

"Anything for you and my subjects daddy."

"Hey, who wants to have ice cream?" Pipp asked.

The ponies all nodded eagerly and decided to go and get ice cream in order to relieve their stresses but suddenly, out of nowhere, a bright glow emitted inside of the throne room which provoked everypony to shield their eyes to prevent getting blind. Ten seconds later, the glow dissipated.

"Whoa, what was that all about?"

The ponies all looked to the middle of the throne room to see a blue deer like creature and two bipedal creatures.

"Um... who are you three?" Sunny asked with a bewildered expression.

Greninja recognised the three of them, they were Ash Ketchum, Serena and Xerneas.

"Ash! Serena! Xerneas!" Greninja exclaimed in happiness as he got off his throne and ran to them all. When he got to them, Greninja hugged his trainer Ash, and Ash hugged back.

"Hello Greninja, it's good to see you again buddy." Ash said patting the earth pony Greninja gently on the back on his head. "How's life in Equestria going on for you buddy?" He asked.

"It's going great, I've got a job that I love, got a wife, and a son." Greninja told him.

Ash looked behind Greninja to see a pink pegasus mare with dark purple hair and a light blue pegasus foal in front of him. He assume that the pink one was his wife and the light blue on was his son.

"Aww, I'm so proud of you Greninja." Ash said patting him again. He then bent down and looked at Hydro. "Hello there, you must be Hydro Petals. My name is Ash Ketchum, I'm your dad's trainer back in his world." Ash introduced himself.

"Whoa, hello there Ash Ketchum."

"Aww, you're just so cute." Serena cooed as she bent down and picked up Hydro in her arms and began to rock him which Greninja gave her permission to do so.

"Hey hey hey, give me back my son now." Pipp demanded.

"Oh, sorry. He's just so cute." Serena said as she gently gave Hydro back to Pipp.

"Who are you three? And what are your businesses here?" Queen Haven asked as she flew off of her throne and approached the three creatures.

"Yeah, you threw are not hostile right?" Hitch asked walking up to them with Sunny, Izzy and Zipp.

"Fear not little ponies, we're not here to pick up a fight." Xerneas assured them all. "I'm Xerneas, the life Pokemon of the Kalos region, these two are Ash Ketchum and Serena, they're humans from our world. We're here to pick up one of Serena's Pokemon named Sylveon." She told them.

Serena turned around and looked behind her to see her Sylveon running up to her happily.

"Sylveon!" Serena exclaimed in happiness as she embraced her pokemon in a hug. "It's good to see you again my friend." She said.

"Nice to meet you Ash ketchum, My name is Pipp Petals, Princess of Zephyr Heights."

"Nice to meet you Pipp, I assume you're the wife to my Greninja?" Ash asked and Pipp nodded in response. "It's sad to see that Braixen did all of this to you." He told them with a sympathetic expression.

"Yeah, on behalf of her, I apologize greatly." Serena told them.

"It's okay Ash and Serena but, she unfortunately has to spend her life time in the dungeons for her crimes." He told them, and they responded with a nod.

"Fair enough." Serena said with a depressed nod. "Anyways, let's go home Sylveon." She told her with a smile.

When Sylveon heard this, she hesitated a little, she didn't want to leave her crush Hydro behind like this. She looked down at the pegasus prince to see him looking up at her with a disconsolate expression of his own as well.

"What's wrong Sylveon?" Serena asked. "Do you want to stay here with Hydro?" She asked, and Sylveon replied with a nod.

Serena was shocked to hear this, she wanted to return to her world with Sylveon but, she has developed these lovely feelings with Hydro Petals, the son of Greninja and Pipp Petals, if she forces her to go back with her, she will fall in a state of depression forever so, without hesitation, Serena lowered Sylveon to the floor and looked at her with a smile.

"You can stay with Hydro if you want to, I won't stop you."

Sylveon was shocked to hear this, she gets to have a choice either to go back to the world of Pokemon or stay with her crush Hydro Petals, she wasted no time and decided to stay with Hydro.

"Hydro!" Sylveon exclaimed pouncing on him in a loving way. Then, both couples began to nuzzle each other affectionately which caused everybody in the room to chuckle.

Serena let out some tears of joy from witnessing the touching and lovely sight. Sylveon is just as she remembered when she caught her when she was a little Eevee. Then, Xerneas came in.

"Since you've chosen to stay in Equestria with your crush Hydro Sylveon, would you like me to give you a new body?" Xerneas asked. "But do not be concerned, you would still have your Pokemon moves with you." She told her in an assuring tone.

Sylveon began to ponder on this hypothetical situation, she can either decide to keep her original pokemon form or, be transformed into a pony and live a happy life here. Since Hydro and his other pony kinds are ponies, she came to a conclusion that it is appropriate for her to be transformed into a pony so that she could fit right in with everypony else.

"I choose to be a pony please Xerneas."

Xerneas respected her choice and spread colourful magic around her which amazed the ponies. A brief second later, white glow surrounded the Sylveon and the fairy type Pokemon began to feel that her body was transforming. Ten seconds later, the transformation process has ended and Sylveon was now in a pony form.

"Whoa! Check you out Sylveon! You're a unicorn just like me!" Izzy exclaimed in happiness.

When Sylveon heard this, she opened her eyes and looked down on herself to see that she had hooves which surprised her, she felt a pointy horn on the top of her head, her colours were still the same and many more. She also noticed that she was the same height at her lover colt Hydro Petals.

"You're now a unicorn Sylveon." Xerneas told her. "I also adjusted your age to be the same as Hydro's as well so that you two can be a loving couple and grow up happily together." She added.

"How do I look Hydro?"

"You look absolutely pulchritudinous Sylveon!"

"Why thank you." Sylveon said with a blush as she kissed Hydro in his right cheek again which caused everyone in the room to squeal in a joyful way.

"Alright Serena, I think it's time we head back." Ash told her.

"Agreed." Serena said with a nod. Then, she looked at her Sylveon once more. "Goodbye Sylveon." She said as she wiped away a tear.

"Goodbye Serena, I will always miss you." She said hugging her trainer Serena.

"Me too, I will never forget you. You will always be in my heart, and I wish you years of happiness in Equestria." Serena said hugging Sylveon back. A brief second later, both Serena and Sylveon released their hug and giggled. Then, Serena walked to Ash and Xerneas again.

"Till next time Greninja, I will miss you!" Ash exclaimed.

"I'll miss you too Ash!"

Then, a white glow emitted around Xerneas, Ash and Serena which caused everypony in the room to shield their eyes once more from the strong glow. Ten seconds later, the glow dissipated again and Xerneas, Ash and Serena weren't there any more meaning that they've been transported back to the Pokemon world aka their home world.

"Welcome to the family Sylveon." Greninja said patting the little filly's back.

"Thank you so much Greninja."

"This is going to be a lovely start." Hydro said hugging his lover Sylveon, and the unicorn hugged back in an affectionate way which caused everypony to squeal in merriment again.

"Aww, my baby colt has finally found love." Pipp said as tears of joy formed in her eyes.

Author's Note

Welp here we have it everyone, my new story has been accomplished! I hope you all enjoyed this one greatly, I had a lot of fun in writing it!