My Little Pokémon: Grander World

Equestria. Manehattan. Afternoon

Due to a wish from Sweetie Belle, just out of fun, a liquid that can age others up had been created. As a result of this, any kids who were now adults, felt like they could do anything, taking advantage of their older ages to do things they could never do at their age.

And they went wild.

The Shopping Centre in Manehattan was at its biggest shopping frenzy in history.

Many, many ponies had transformed from young kids into adults and older, their bodies having changed greatly. Their clothes became looser, their horns larger and their tails longer. They had become much taller, and more muscular, their bodies now filled with more mass and weight.

There were some that had become even more aged. Elderly ponies with wrinkled skin and hunched backs were wandering the halls. Others had become younger, with the same appearance and size as foals, their clothing much smaller and tighter.

"Hm. This could be good for publicity, actually." The owner of the store didn't mind the children taking over. They were having fun and weren't harming anything. "I could use that water as a new marketing item. I can see it now. Buy an Aging Drink and get 30...no, 40% off."

"Sir..." One employee groaned. "We should probably try and do something about this. We'll lose our other customers in the process. Just because they're older now doesn't mean they still can't shop here.

"But look at how much the kids are buying! Not even the adults go this wild when shopping!" The Manager pointed out how the children went on a larger shopping spree than most adults usually do. With no limits on what they can buy and how much, they would go nuts. "Not even the Elders are buying anything either! This is the perfect opportunity for a marketing plan! Get a bunch of these kids to promote this shop and our sales will soar through the roof!"

"Ugh, I swear, everytime this happens, this place is doomed." The Employee rolled his eyes, seeing another one of his coworkers being pushed aside. "You know...eventually, something like this could be solved."

"Solved?" The Manager repeated, confused.

"You know...most of the time, Ash and his friends show up to solve problems like these. You might not get this forever."

"!!" The Manager was shocked by the words. His employee as very much right. Technically, this was a problem for the actual adult who were now elders and if something like this exists, no doubt, a solution would come. That was how it always played out. "Hah...Yeah. Oh, well. Ill enjoy it while it lasts. Go crazy, kids! Buy as much as you want, so I can get way more profit!"

Cloudsdale.

The chaos was mostly contained in Manehattan, where it was most prevalent. Other locations were rather tame with less individuals to worry about. Over at Cloudsdale, a mischievous Rainbow Dash had appeared before her parents, showing up as a child. She's the one who wanted to prank someone, so she figured she would do it to her parents first

However, it would backfire on her soon.

"W-Wait...What do you mean, 'Bath...?!'" Rainbow Dash stuttered, backing up as her mother looked down on her with a sharp grin.

"Oh, it's been a while since you were this little, Rain-Rain. I can still remember how you would get mud all over your hooves and try to play. Even back then, you had no sense of direction and you were such a scatter-brain. Always falling over, hurting yourself." Windy Whistles giggled.

"Mom, c'mon!"

"And besides, lately, you've been getting into the wildest scenarios, doing your best with your friends to keep everyone safe. I can only imagine how much dirt and dust you've kicked up. It's time to cleanse you."

"N-No...That's fine! I-I don't need that! I can do it myself! I just look like a kid, I'm still mature enough for that!" The little pegasus pleaded. But was too late. Her mom advanced on her, grabbing her daughter in a bear hug, trapping her within her powerful, warm hooves. The little filly screeched as she was dragged into the bathroom, wailing and yelling as her mother gave her the greatest bath ever.

Rainbow Dash's prank had greatly backfired as the Nostalgic feeling her mom got overtook it with absolute ease. Windy Whistles was happy and over the moon, washing her child like she was a foal again, even making some bubbles on her head, causing her to giggle a bit.

"Aw, come on! Not even when I was a baby did I have to put up with this! Mom! Lemme go!"

"I'll take full advantage of this while I have the chance~" Windy hummed while scrubbing her hair. "Even if it's for a day!"

"I'm going back to the Fountain after this..."

Meanwhile, Ash was on his way to Manehattan, wanting to see what was going on there since the root of the problem started there. As he was running, the magic from the rain droplets kept affecting him, slowly ageing his body up. He was growing at slower rate than everyone else who accelerated in just seconds. Appearing alongside him was Twilight, still in her younger-state.

"Heading to Manehattan too?" Twilight questioned him.

"Yeah. You saw the news too, right? There's like a Reverse Fountain of Youth there. Not sure what to call it, but it's awesome!" Ash grinned.

"Strange how it just so happened to appear after we tried out the Fountain of Youth in Universe 28..." Twilight mused. "We were in a completely different universe and this just now shows up? What's up with that?"

"Pika..." Pikachu wondered himself, running alongside Ash.

"Yeah, that is pretty weird." Ash himself acknowledged it. "But it's strange...It feels like I know about something like that. This kind of magic..."

"Same..." Twilight squinted, being on the same page. Only she and Ash felt this way. No one else did. After a few seconds of silence, they both figured out why that was the case.

Whenever there was something new that came up and the two of them were the only ones to recognize it, it was mainly due to the fact that something like it came from the Lost Universe and the souls of Prisma and Twilight Luminaria resonated within them, causing them to remember. "You don't think it's something from the Lost Universe, do you?"

"Huh. It could be. Man, that universe had a lot of crazy stuff, didn't it? Well, if it is, then it's just another thing that got revived. I guess they won't stop coming back until everything from that world shows up. Who knows how long that'll take until it ends..."

"Mhm. We-" But just then, Twilight gasped, seeing how Ash's body would flash for a moment and out of that light, he emerged as his 10-Year-Old self. The day he first started his Pokemon Journey. "Wah! Ash?! You aged?!"

"Hm?" Ash stopped running, checking out his arms. He aged up three years, no longer being 7. "Woah...Cool. But, I don't look like my real current age. I look and feel like I'm 10 Again."

"Is that a sign of the Fountain of Youth's effects running out? But...Why isn't it happening to me?" Twilight pondered, unaware that it was not the Fountain of Youth doing this.

Eventually, the duo arrived at their destination, where chaos was already unfolding. What really interested them was the new Fountain out at the large lake in the center. A massive crowd was surrounding it, looking at the water, seeing that it had turned a blue and purple colour, and not just that, but it had a strange power radiating off it, a bright glow that lit up the surroundings.

"Check it out...So that's it.." Ash's eyes widened, gazing at the fountain. The magical water had spread and now it had turned into a lake. He had seen plenty of amazing sights, but the sight of a brand-new Fountain appearing out of thin air, in the middle of a lake was one to behold.

And when looking at it, he and Twilight felt like they've seen it before, the souls of Prisma and Twilight Luminaria resonating within them. They didn't get it until now, but this wasn't a Fountain of Youth. It was an ageing Fountain, causing whoever drinks it or touches it, to age.

"Hm. So, what're you going to do about this, Ash?" Twilight questioned.

"Uh..." Ash scratched his chin, pondering. He was a lot less mature, being back at the age he was when he first began his journey. As such, his decision-making would be slightly more carefree. "How about we wait and see how it turns out? If people get outta hand, we'll take care of them."

"Ash. That doesn't sound like a good approach. Not what you usually do." The young Twilight raised an eyebrow. "I think you're brain is taking it's time to age up as well. You should think a little more responsibly."

"Pikapi." Pikachu agreed, looking at the older Twilight, wondering if she was going to intervene.

"What about you? You still haven't changed. You're still little." Ash pointed out, finding it odd how Twilight wasn't showing signs of ageing up whatsoever.

"Yeah...Maybe it's not the Fountain of Youth." The little alicorn pondered. "Could it be...this new Fountain? Ash, did you drink from it?"

"Nope. I haven't." That is until he recalled something. "Well, I guess I did get drenched in water for a little while. It was raining back home and the rain looked a little bit different than usual."

"I think that might've caused you to age up then. It might not just be the Fountain that this magic is in." Before Twilight could say anything, right before her eyes, Ash was ageing once more, the light shining. But he did return to the age he should be at the moment. Instead, Ash kept growing up, slowly approaching a new age. Pikachu and Twilight gasped, stepping back as they laid their eyes upon a new and much older Ash Ketchum.

Out of that light emerged an Ash Ketchum who was as tall as Champion Leon. He was past his true age, being much taller than before. He looked more muscular than before, his arms were filled with more mass, his waist and legs were also filled with the same mass, and his upper body had become broader. The boy had gotten stronger and more mature, looking far different from before. He looked like he was at least 32-35 Years Old, towering over the two, even taller than he usually was.

"Huh?!" Ash gasped, checking himself. He felt the sudden growth and noticed that his arms and legs felt bigger and thicker, his muscles much larger and his chest more broad. He was a lot taller than he was supposed to be. In fact, he looked a lot like Prisma.

"Oh my..." Twilight's jaw dropped at this older Ash. If only she were her original self right now, she would be inredibly elated at this sight. But she still was. Like a fangirl. She could only blush and look away, covering her mouth, holding in her squeal.

"Pika! Pikapi?!" Pikachu did a double-take at his partner.

"Man...This is weird." Ash felt his arms, holding them out. He didn't expect this to happen at all. "Oooh...Is this what Bruno and others feel?"

"Ah! What am I doing?!" Twilight realized she could age herself out of this 7-Year-Old state by having the water affect her. Quickly, she flew over to the Fountain and took a dive. Her body would be covered with the magical water, allowing her to grow up, slowly turning her into an adult, no longer a foal. "Oh...! It's happening...!"

"Twilight?! Won't it take you to an age that's not yours too?!"

"Ah-" But it was too late. Twilight did not think that through like she usually does. She was so excited to get out of this young state that she instantly dove in. Even though she was a clever pony, the tendencies of being a child had affected her thought process and clouded her judgement, just as Ash's had.

Her body went past her true current age as she emerged from the light as a much older pony. In fact, she had grown to the size of Princess Celestia herself. Her mane became longer along with her tail, an ethereal aura blessing them both, her horn was now much larger, her wingspan had expanded a lot, her face became more defined and more beautiful.

Her entire form was like that of a mture alicorn. With her new appearance, the mare looked just like the image of her Original Incarnation, the one named Twilight Luminaria. She was the perfect embodiment of a Queen but she also technically looked like Empress Twilight and other older Twilights, albeit with much more vibrancy.

"M-My mistake..." Twilight grumbled, lowering her head. She didn't mean to jump in the way she did. But the temptation to return to her regular form had overtaken her, causing her to act a little hastily. Now, both Ash and Twilight looked like Primsa and Twilight Luminaria. "In any case, we should deal with this now before it gets out of hand. Getting them all back to their original ages will take a while and some will need help, since not everyone can get the water, especially the elders."

"Do you think we head back to Univers 28? I say we use that to get all back to how they were." Ash suggested the usage of the Fountain of Youth.

"Probably. There is a spell to age them all down but it's far too powerful for even me to use so casually and it only turns them into babies. So, yeah. We'll have to go back to Universe 28. But before that...how about we round them all up?" Twilight smiled as Ash smiled back at her. The two were on the same page.

To solve this, they were first going to make sure all the adults would be rounded up into one spot so that they don't try and flee or cause chaos in other areas. After all, they were currently in control of the Manehattan shopping centre. The last thing they needed was an old pony going crazy.

As the Children relished in their advantage, buying as much as they could, right at the entrance, the doors opened with an audible sound, grabbing the attention of many on this floor of the shopping centre. Some dropped their bags upon seeing the two figures appear from the light of the Sun. Their figures were temporary silhouettes, showing their power appearances.

"W-Who are you...?" One pony uttered.

"Who are we?" Ash smirked as he and Twilight were ready to do a role call just for that stylish factor, similar to what Team Rocket does. "Ash Ketchum! Future Pokemon Master and Monarch-in-waiting!"

"Princess Twilight Sparkle. The Princess of Friendship herself, at your service!" Twilight made a royal pose, smiling at the crowd, showing her majestic and stellar beauty, a radiance that the children only see on certain figures.

The kids were shocked and awed by the sight of these two, feeling the pressure of their aura. The ponies were especially flabbergasted and overwhelmed by the presence of Twilight, their own princess being right here.

"Ash?! Princess Twilight?! How?!" A pony was kerfuffled by this sight. "They grew up too?!"

"They look so cool! And pretty!"

"Alright. You guys have had your fun." Ash tightened his gloves. "But it's time to bring things back to how they were. It could get way out of control pretty soon, ya know."

"We'll have to test a few things out to turn you back to your original ages. But before we do, I know for a fact none of you are going to stay still, are you?" Twilight raised an eyebrow.

"Right on that! We're having way too much fun and it'd be way too soon to say goodbye to this!" A foal piped up. "No way are we turning back! This is awesome!"

"Yeah!" All the Adult-turned Foals agreed, words rapidly coming from each of them.

"Alright then, it's decided." Ash saw this coming and was more than ready in this mature body. "I'll be rounding you up for us. But...How about we battle for it? Let's all have a Pokemon Battle to decide it. Whaddya say?"

"If it means we get a chance, then sure!" The children instantly agreed, each of them holding out their respective Poke Balls. "But what if we win, huh? You think we'll still turn back after all that?"

"We expect you too." Twilight flipped her mane as Espeon narrowed her eyes at the children. Pikachu did the same, a smile forming on his face as his red sacs would crackle with electricity. The duo then looked at each other, ready to battle alongside one another in this store.

All the children threw their Poke Balls, summoning their respective Pokemon. Many, many Pokemon appeared one after the other, filling up the already crowded mall with an abundance of Pokemon. A massive horde of Pokemon surrounded the two, looking at the pair, each Pokemon wanting to win.

"W-Wait...Y-You're gonna do it in here?!" The Manager soon realized what was about to happen. But before he could stop it, it was too late. The first attack had been called out.

"Noctowl, use Air Slash!" With one pony calling out to her Noctowl, the brawl began as all other Pokemon on the opposing side went on the offensive, ready to overwhelm Pikachu and Espeon, the two small Pokemon that looked like they wouldn't stand a chance against the huge group of Pokemon.

"Pikachu, use Quick Attack!" Ash was quick to start things off.

"Eve, Shadow Ball!"

"Pika!" Pikachu would dash at lightning speeds, leaving behind a white afterimage while Espeon shot out a blob of shadows that materialized in front of her, the attack moving alongside Pikachu's.

The combination of their attacks were sent straight into the enemy ranks, pushing them back and causing the first line to fall, the impact knocking the Pokemon out cold, causing the owners of those Pokemon to cry in distress, realizing their Pokemon had been knocked out and defeated in a matter of seconds.

"Stantler, use Hypnosis!" Another opponent had called out. The Normal-Type's eyes glowed a bright red colour, sending waves of energy across the battlefield. Pikachu was quick to avoid it, zipping to the side. Espeon wasn't so lucky, the waves affecting her and forcing her to close her eyes, unable to keep them open.

However, that's when her ability kicked in. Synchronize. Instantly, Stantler was also put to sleep, hit with the effects of its own move. But not only that, Pikachu had a solution to his friend's current state.

"Pikachu! Use Thunderbolt!"

"Pikaaa...!" Pikachu leapt into the air, all the Pokemon here looking up to see his body shining thanks to the Sun beaming through the window. "Chuuu!" From his body and all over the place, Pikachu unleashed 100,000 volts of lightning in various directions, spinning his body midair to make sure the attack covered a lot of ground. The Electric-Type landed on the ground, looking up as he saw the wave of his lightning spread around, hitting almost all the Pokemon here.

All of the Pokemon that were struck by the electric wave were electrocuted, the currents of electricity running through their bodies, causing them to convulse, their bodies sparking. The wave of electricity spread through their bodies and caused the majority of the Pokemon to faint and fall onto the ground, the electricity still running through their bodies.

"Esp!" And of course, that instantly woke up Espeon, shocking her awake and waking her up. "Espeon!"

"Great job, buddy!" Ash commended his partner who gave him a thumbs-up.

"They're wiping the floor with us!" A pony exclaimed, her hooves on her hair as her mouth was agape, witnessing the power of these two and their partners.

"Not yet! Let's see them stop this!" One pony whipped out a Z-Crystal as an ace in the hole. In this case, it was the Icium Z. She placed the crystal on her ring, the Power of Alola surging through and resonating with her Cryogonal. The pony then began striking a series of poses, the energy building up within Cryogonal. Pikachu and Espeon readied themselves, knowing a Z-Move was nothing to scoff at. "Cryogonal! Subzero Slammer!"

"Cryo!" Cryogonal ascended, creating a platform of ice that rose from beneath its feet. After summoning this platform, Cryogonal converted it into raw energy, firing a massive beam that threatened to freeze everything around it. Pikachu and Espeon had to act fast, or else, they would get caught up in the move.

"Together! Counter Shield!" Ash and Twilight bellowed in unison.

"Pika!"

"Esp!" Pikachu and Espeon both got on their backs, performing the Counter Shield. They spun around, Pikachu using Thunderbolt while Espeon used Dazzling Gleam, the two combining their moves, creating a frantic barrier of electricity and rainbow light.

Pikachu roared as he spun faster and faster, generating even more power than before, the speed increasing drastically. His lightning clashed with the Ice-Type's move, the beam crashing against the barrier, the sheer force and impact of the collision sending a shockwave of powerful wind and debris that blew back everyone around them.

Cryogonal was pushed back by the shield, its power was overpowered, and in no time, the beam had dissipated and it's Z-Move failed. However, the Pokemon's momentum sent it flying right into a shelf, which crashed down on it and crushed the Pokemon, rendering it unable to battle anymore.

The attack left the entire store frozen and icy. Pikachu and Espeon ceased the attack and the Counter Shield, looking up at the damage that they had caused. All opposing Pokemon on the other side were completely frozen, including the manager and the staff.

"Oops." Twilight giggled nervously.

"I-It's alright...Just minor damage." A staff member said as his lips were trembling. He was the only one that wasn't frozen, though he was shivering like crazy.

"We got obliterated..." One pony said as they all did not stand a chance. They knew their opponents were strong, but they had no idea the kind of strength that they possessed. It was an incredible feat that the two did.

"Now then. That's what we do to Pokemon and humans. Let's try and do something about your ages."

Universe 28. Equestria. Canterlot. Canterlot Castle.

Later, after keeping them all restrained, Ash and Twilight returned to Universe 28, ready to age down. However, as soon as they got there, a huge problem came that blindsided them and even Princess Celestia.

"EH!? We can't turn back?!" The duo bellowed in shock. After drinking from it, the magic had no effect on them whatsoever.

"S-Sorry...I should've mentioned that I recently created this fountain. I only plan to use it when I'm older. But I don't know why it's not working on you two anymore." She bowed, giving her sincerest apology. "I-I'll try and see if I can do something in the time being."

"So...We're stuck as adults?!" Twilight shrieked.

Her and Ash were now stuck as these mature forms until a solution can be found. But right now, they weren't going to get their solution in the place where it all started. As how things are now, Ash Ketchum and Twilight Sparkle were now full-on mature adults, strongly resembling Prisma and Twilight Luminaria as the journey continues.

Chapter 591 End.