From Rotom's account, Xia Chi learned about this world's legend of Latios and Latias.
Long ago, a kindhearted couple in Alto Mare found a badly injured boy and girl in distress by the sea.
They brought the two back to their home.
Under the couple's devoted care, the boy and girl soon recovered.
Rather than leave, they chose to settle in Alto Mare.
An unknown amount of time passed before some mysterious dark force invaded Alto Mare.
Just as the magnificent city of canals faced destruction, the siblings unleashed an incredible power that held the darkness at bay.
They were actually Legendary Pokémon who had taken human form: Latios and Latias.
The two Pokémon called upon their companions, who brought a treasure capable of dispelling evil, known as the [Soul Dew].
The Soul Dew's power banished the evil, calmed the raging waves, and saved Alto Mare from the brink of destruction.
Peace returned to the island.
Afterward, Latios and Latias left the Soul Dew there and returned to visit from time to time.
Naturally, the story ended happily-
From then on, the people of Alto Mare lived peaceful, happy lives, and evil never encroached upon the city again.
"Hmm, that legendary Soul Dew is now kept in Alto Mare's famous Holy Church, roto!"
Listening to Rotom's explanation, Xia Chi fell into thought.
The main thread of the story more or less matched the plot of Pokémon Heroes as he remembered it.
But he remembered the [Soul Dew] being kept in the Secret Garden at the center of the city, rather than the Holy Church everyone knew about.
He wondered whether this was a smokescreen set up by Alto Mare's residents or a difference between timelines.
And another thing-if the Soul Dew was in Alto Mare...
Then what was the one