In a parallel world, Ash, Goh, Chloe, and Serena are facing a strange predicament. They are in a world where time flows backward, causing Pokemon to change back into eggs!

Together with their parallel-world counterparts, they begin to investigate the Spear Pillar, where they find the legendary Pokémon Dialga and Palkia locked in an intense duel.

"We have to stop this," Ash says, determination evident in his voice. Everyone agrees, knowing the consequences of this battle's end could be catastrophic.

Suddenly, the parallel world's version of Team Rocket appears, aiming to take advantage of the situation. However, with a unified front, our heroes manage to defeat the mischievous trio.

As they celebrate their victory, a strange phenomenon occurs. They are affected by the reversal of time and begin rapidly regressing in age!

They try to resist, but within moments, they all become preschoolers! It's a bizarre scene; miniature versions of themselves, standing amid the chaos of time reversal and Pokémon battles.

Desperate, they plead with Dialga and Palkia, the deities of time and space, to stop their strife and restore balance. Their pleas seem to fall on deaf ears as the clash continues unabated.

Then, as a last resort, they call upon Arceus, the Original One, who appears and uses its immense power to quell the conflict between Dialga and Palkia.

With a peaceful resolution at hand, there's just one problem left - our heroes' age regression. They turn to Arceus, their hope glimmering in their young eyes.

However, Arceus reveals that to restore their right ages, they must spend six years in the past, reliving their lives without their Pokémon. They accept, knowing there's no other choice.

So begins a new adventure. In a world where they are strangers, our heroes must navigate their way back to their Pokémon and each other.

As months pass, they each experience the joy and hardship of growing up again. It's a challenge, but they never lose hope, knowing they are destined to reunite with their Pokémon.

Over time, they gradually adapt to their circumstances, learning to survive and thrive without their Pokémon companions. They are carving new paths, with renewed strength and determination.

Unbeknownst to them, their Pokémon are also making their own way in this altered timeline, growing and waiting for their trainers to find them once again.

As the years pass, they individually encounter the Pokémon they befriended in their original timeline, rekindling their bonds. Serene reunites with Eevee first, followed by Chloe with Yamper, Goh with Scorbunny, and finally, Ash with Pikachu.

Their reunions are emotional, filled with joy and relief. Each Pokémon recognized their trainer, and it was as if they had never been apart.

Ash is the last to find his beloved Pikachu. When they finally reunite, it's a tearful event. Pikachu leaps into Ash's arms, and they share a heartfelt moment of joy and companionship.

With their Pokémon by their sides again, they continue their journey, eager to reunite with each other next. They feel closer to their original timeline, their hope escalating.

Despite the challenges the world throws at them, they persevere. They grow in strength, resilience, and friendship, their bonds with their Pokémon stronger than ever before.

Chloe is the first to cross paths with another. She stumbles upon Serena during a journey, and an ecstatic reunion ensues. Together, they set out to find Ash and Goh.

Meanwhile, Ash and Goh, having experienced their own adventures, finally reunite. They decide to find Chloe and Serena, and continue their journey together.

The final reunion takes place in a small town. Ash, Goh, Chloe, and Serena come face to face, their happiness evident in their glowing smiles and joyful tears.

They spend the night sharing stories of their adventures, grateful to be together again. Their journey across time has made them stronger, both individually and as a team.

The next morning, they set out prepared to face whatever comes their way, as long as they're together. Their bonds with their Pokémon and each other have never been stronger.

Though their journey began with a crisis, it ended in success. They had not only saved the world from a time-space catastrophe but also discovered the true strength of their bonds.

Looking at the horizon, they realise that their adventure is far from over. But they know, as long as they have each other and their Pokemon, they can overcome any obstacle.