Reunion - an Amourshipping one-shot

This is a multi chapter version of the original Reunion book.

Welcome to my first Pokemon fanfiction. This is my first story, so it won't be perfect, but I made this story as an idea for other fanfictions to use, but decided to give it a try myself. So, this is basically about how Ash manages to remember so much from his past, he remembers a promise he and Serena made for each other. What is this promise? Find out in the story.

Disclaimer: I do not own Pokémon, which means I do not own any of the characters from the anime or the games. The only character I own in this story is the Commander. The original image in the thumbnail belongs to WillMasterDino55 on DeviantArt.