As our heroes continue their journey to snowbelle city Bonnie finds a Zygarde core in her bag which she nicknames squishy Ash and Serena both look in their brand new pokedexs and find that there is no data on this Pokemon. Meanwhile our heroes run into sawyer and end up fighting team flare who are after Zygarde core.
Ash and his friends run across Nurse Joy, who is stuck in a crevice. When they help her, they discover that Nurse Joy and her Audino do not always get along. Nurse Joy hopes the Mega Stone she found will help create a deeper bond between the two.
As the heroes and Team Rocket go to sleep, a Darkrai appears and casts dream spells on them. This places Pikachu and Meowth in Squishy's dreams. The two begin to see the past and future of Squishy as well as the gang's Pokémon.
The gang meet up with their ninja friend Sanpei, who invites them to his village for a festival. However, they soon get interrupted when a Ninja Army attacks and kidnaps the village's chieftain. An unexpected turn of events happens to Ash's Frogadier.