Ash has managed to reach Ho-Oh and discovered many unknown secrets, about the earth, about himself and about the future, but has thought he should keep it to himself. After the fortunate adventure, our heroes are walking back down the Mountain.

"So, what next Ash?", Brock asks Ash.

"We should be heading to Cerulean Cave!", Ash gives the most unexpected reply.

"Are you out of your mind!", Misty replies in shock.

"No, I have to go there no matter what", Ash tells. Serena wonders to herself, what they were talking about. And, Rotom Dex wanted to click the pictures of this mysterious cave.

After a lot of walking, climbing, jumping and flying, our heroes finally reach the Cerulean Cave.

"You guys, stay outside, I'll be back soon, even you Pikachu", Ash tells everyone present, and the most disappointed one being Rotom. Ash enters the cave and walks towards the deepest part, without a second thought. Hearing Ash's footsteps, a meditating Pokémon opens its eyes. Ash now walks to the mysterious Pokémon.

"Mewtwo...", Ash starts, but before he could say another thing, Mewtwo interrupts.

"Ash Ketchum, I know the reason you've come here. Be assured I will be there to help you at the exact time you need my help. The world belongs to everyone People and Pokémon, and if someone is going to destroy it, I'll be there to defend it no matter what. That's what, Master Red taught me, and I shall oblige to it", Mewtwo tells Ash.

"Thanks, Mewtwo", Ash replies and heads out. After going out Ash sees his friends tensed to their peaks, they look at Ash and soothe themselves.

"What happened Ash?", Misty questions.

"You guys will get to know soon", Ash replies them.

"What happened to this guy?", Serena thinks to herself.

Everyone leaves to the Cerulean Gym, have their lunch and disperse, telling their goodbyes. On their way back, Ash contacts Professor Kukui and gets to know that he's extending the facility and also, with the help of the other kids building a new house. Ash thanks the Professor for what he was doing.

Ash and Serena were walking back home. Suddenly they see a flash of light about to hit them, but the attack was stopped, an enraged Gyarados was attacking the forest. Another hyper beam was targeted towards Ash and Serena, the attack was blocked again. Ash looks around, he sees nothing, he then grabs Serena by the hand, and runs behind the trees. Ash thinks to himself.

"Aura! Yes, Aura", Ash thinks to himself. He then tries to use his Aura, and look through objects, After a bit of struggling, Ash gets surrounded, by a thin blue layer. Serena, who was looking at Ash, was amazed and scared at the same time. But Ash ignored Serena's fear and kept looking. He could see it, a Pokémon, fighting against the Gyarados, it was wearing a cap, very similar to Ash's.

"Primeape!", Ash says to himself.

"Pi!", Pikachu wonders hearing Ash's words.

"Pikachu, I need your help", Ash tells turning towards Pikachu, "And Serena, your help too, come on, use Rowlet", Ash tells Serena.

"Pikachu use Electro Web!", Ash commands his Pokémon.

"Rowlet Leaf Blade!", Serena commands Rowlet. The Primeape sees the attacks and turns towards where those attacks are coming from. It focuses on the trainer helping it. Ash eyes it.

"Long time Bud", Ash tells the Pokémon, and it smiles back at its trainer.

Ash and others together defeat the Gyarados, Ash catches the Gyarados. Primeape looks at Ash, it knocks him and takes his cap, Ash chuckles as Pikachu shrugs. Primeape wanted to go back to Ash. And so, Ash catches Primeape too. It's almost evening and Ash and Serena are on their way back home, Serena still scared at Ash's action. After a while of walking, Serena falls asleep, and Ash decides to carry her.

"I'm home!", Ash yells opening the door. He was carrying a tired Serena.

"Honey, I'm so glad you're alright", Ash's mom replies coming out of the kitchen, she then sees Serena. "Oh! My what happened to her", she asks Ash.

"First help me place her on the couch", Ash replies to his mom. The two of them place Serena on the couch. Ash's mom turns towards him.

"You haven't answered my question yet?", she reminds him.

"Serena has fallen asleep on the way back home, I had no other choice than to carry her", Ash replies.

"Oh, I see", his mom replies. She then starts to walk to the kitchen, when Ash calls her.

"Mom, I've to ask you a thing", he tells her.

"Yes?", she replies

"Mom, do you know where our ancestors are based from?", he asks out of nothing.

"As far as I remember, your dad always used to say, that one of our ancestors, Satoshi, was based from Kalos", she replies.

"And, uh mom, were Mr. Red and dad friends?", he questions her again.

"Well, you see, your father, Gary's father and Red, were all good friends", she replies.

"I see, thanks mom", the kid replies.

"Anyways, why'd have to ask me these questions?", Delia questions Ash.

"Nothing much just wanted to know something", Ash replies. Delia shrugs and goes into the Kitchen. Ash starts to sleep in a place where he was sitting. A few minutes later, the doorbell rings. Pikachu wakes Ash up, so he can see who it was.

"Who's it?", Ash tells opening the door, he was amazed to see who it was.

"I've come to the correct place", Grace replies.

"Mrs. Grace, you're here in Kanto?", Ash questions her shocked.

"Who is it?" Delia questions coming out of the kitchen.

"I've come here, because, tomorrow is Serena's birthday", Grace replies.

"Well, she's sleeping", Ash replies, his mom then comes stands next to him.

"Oh, hi you must be Delia", Grace greets Delia.

"Mom meet Mrs. Grace, Serena's mom, and she's here because tomorrow is Serena's birthday", Ash tells her, pointing towards Grace.

"Hello Grace, my names Delia, and welcome to Ketchum residence", Delia replies.

"Anyways, where's my baby?", Grace asks them.

"She's sleeping", Ash tells her.

"That's even greater, I can directly surprise her tomorrow", Grace replies.

"In that case, why don't we head to my mom's room?", Ash says pointing towards Delia's room. They all slowly sneak into Delia's room and start to talk about everything they can, from Ash and Serena's childhood to now and Serena's birthday. After a few moments, everyone starts to feel hungry.

"Ash, can you check, whether Serena's awake?", Grace asks him.

"Sure, why?", Ash questions back.

"Ash, you're such a Dumbo, if Serena sees her, it won't be a surprise anymore", Delia replies.

"Oh", Ash tells, he goes out of the room and checks whether Serena is still sleeping. He then informs the two elders, who slowly without making any noise complete their dinner and leave for Delia's room. After some time, Ash wakes up Serena, and they have their dinner. And they two go to sleep too, Ash on the couch and Serena on Ash's bed.

It was around midnight, Ash walks into his room and wakes Serena up. She was sleeping peacefully, and her face was glowing like the moonlight. "Hey Serena, wake up", Ash says, tapping her shoulders. Serena doesn't move. He now taps her a bit more, when she slowly opens her eyes, wiping them.

"HAPPY BIRTHDAY SERENA!", Ash greets her, a bit too loudly, so their parents woke up too. He then hugs her.

"Oh! Thanks, Ash", Serena replies returning the hug. In the silence of the night, the two could hear footsteps. The two were still hugging each other, when both their parents enter Ash's room. Delia and Grace were folding their arms and tapping the ground. The two noticed this and broke the hug.

"What are you two doing up this late at night?", Delia asks the kids.

"Well, I just couldn't sleep, so came to wish Serena", Ash replied.

"Mom, what are you doing here in Pallet town?", Serena asks her mom surprised.

"Well, I came here because today is your birthday", Grace replies. Hearing the voices upstairs, Pikachu woke up from its sleep.

"Oh, I see", Serena replies.

"Happy Birthday Baby, you've become 16 now", Grace says hugging her daughter.

"Happy Birthday Serena!", Delia says with a smile.

"Thank you!", is all Serena could say.

"And, Ash I'm sorry for misunderstanding", Delia says to her son.

"Not a problem Mom", Ash replies.

"Pika...", it says drowsily.

"Look who's here", Ash tells the others, looking at his pal, "Pikachu, today's Serena's birthday, and I want you to wish her", Ash tells Pikachu. Pikachu's sleep fades away as soon as it hears the word birthday.

"Pi!", it says before running up onto Serena's shoulders and nuzzling its cheeks with hers.

"Pikachu, that tickles!", Serena says laughing. Everyone else has a laugh. Ash slowly walks back onto his writing desk, opens the draw without anyone noticing. He then slowly picks up a gift, still, no one noticing him. He then starts to speak.

"Hey Serena, Happy Birthday", Ash tells her handing the package. Serena takes the package, and before opening it, looks at Ash for approval, he simply nods. She unwraps the packaging and, inside it were plane tickets. She cups her mouth in shock.

"Th...These are tickets to Alola!", Serena exclaims, hugging Ash, they were looking into each other's eyes and were about to kiss.

"Ahem, Ahem!", both the parents say in unison. Ash and Serena realize the presence and break the hug in embarrassment.

"Those things, only when you two are alone", Grace replies.

"And it's too late to be awake kids, we should get some sleep", Delia adds, leaving the room, Grace following behind and Pikachu pushing itself outside through the almost closed door.

"Well, guess it's just we both for the night", Ash says looking at Serena. Serena looks at Ash, and they both have eye contact. Their eye contact slowly turns into a kiss and fall on the bed still kissing. They break the kiss for air, and slowly they go into a deep sleep, cuddling each other.

In the morning after the parents wake up, the go-to Ash's room to check whether the kids were up to anything, but, seeing them both cuddling and still sleeping, the two mothers smile at each other. Ash and Serena both wake up in good season. The day went on like any other birthday would go, and they had a party that night. Everyone retires to sleep. Ash's and Serena's flight to Alola was the next day.

: Kanto Airport, Kanto :

"Well, it's finally time", Ash says stepping onto the escalator. Serena following behind.

"Bye kids take care", both Delia and Grace say in unison.

"Bye Mom, Bye Aunt Grace", Ash waves back at them.

"Bye-Bye", Serena also waves back at them.