A rumor had spread throughout the world.
After the world-ending disaster ten years ago, the severely weakened World Tree had taken a long time to recover.
Moreover, because it had once been invaded and occupied by darkness, the Regi trio that had originally guarded the World Tree had fallen.
And Regigigas, the so-called "Glue Guy Regi King" that had now signed a guardian contract with the World Federation, had been unable to create Regi guardians of that level again due to material limitations.
Thus, the World Tree had lost its guardians.
Fortunately, one of the Pokémon left behind by the savior who had rescued the world—Lucario, who possessed the special bloodline of the Royal Family—had taken over that responsibility from Mew, the Mythical Pokémon that shared a symbiotic bond with the World Tree.
Since the beginning of the new era, it was not as though no ambitious people had coveted the World Tree or the Mew symbiotically bound to it.
But before they could reach either of them, every one of those people had fallen outside the World Tree.
—Even if they possessed the strength to break through the protective perimeter formed by wild Pokémon, by the time they came to their senses, their entire side had already been completely defeated. All they could see was the departing back of a "blue flash," and no intruder could advance another step.
That had become the world's greatest unsolved mystery over the ten years since the new era began.
Had that Lucario become so fast that even Elite Four Level and Champion Level Pokémon could not react?
Or had its Aura, strengthened by the extraordinarily vigorous vitality blessed by the World Tree, interfered with their senses?
Or, more outrageously, did it actually possess some kind of ability to control time...?
The answer