From The Pages of a Diary

Serena , a young girl from Kalos, is set upon an adventurous journey through the frigid region of Sinnoh. Following her father's wish , she became a trainer but her heart is not in the business. Nor she wants to defy her father's words until a Wandering Ranger of Kanto inspires her to do so.
In this ancient land of Sinnoh , there are many great powers trying to stumble out of their sleep.