Prologue
-Spear Pillar (After the events of XY)-
The summit of Mt. Coronet was dotted by many celestial beings in the midnight sky. Since the heroic efforts of Dawn and Lucas defeated Giratina and Cyrus in Distortion World, many Pokémon Trainers seldom come visit Spear Pillar. Usually, Spear Pillar is like a ghost town, but this night was not an ordinary one.
At Spear Pillar, two Pokémon are contemplating the huge shift in time and space. Jirachi, the Wish Pokémon said, "So, I just met this woman with a dress on. She had a big frown on her face like it was the end of the world." Palkia chided, "That's silly; no one in Sinnoh is like that. Well, except Caitlin, but she moved to Unova in order to be an Elite Four."
"Pardon me. I'm so sorry."
Cresselia interrupts the conversation with "I spotted a Cofagrigus in Route 4."
"Where?" demanded Palkia.
"Unova."
"Don't you think that's a little too common? I can see Yamask at any time. I'm omnipotent."
"Actually, it doesn't seem like a Cofagrigus."
"What?!"
"It seems to be talking about life in 'the New World'. Humans know that Pokémon regularly hide their real voice."
"There seems to be someone coming up here. Look away."
Cresselia and Jirachi vanish into thin air. At the stairs, a black dragon is climbing up the stairs with feet stomping so loud it could make a Whismur have hearing loss.
"Who's there!?" scolded Palkia at the visitor.
"We're going to have a little talk, okay? Come on, it won't hurt a bit."