What if: in XYZ 47, they are trying to look for Dedenne. He ran off in the woods. Ash and the other decide to split up and look for them. While doing this Serena fell because of a tree root. She is scared and something comes out of a bush, it is a...
Poliwhirl! She has sprained her ankle and calls for help. Ash finds her and he helps her. They get flashback to when they first met, they laugh qnd Serena decides to confess (or not) because this is how it all started. At the end of the episode they find Dedenne but thry are late for the plane. So in the hurry of time, Serena gets on the wrong plane and this plane goes to... PokéHawaii. She hears there are no planes to Hoenn and she decides to wait here and sleep a couple days. Then she decided to call Ash and he says he's on this Island too! So she stays at the same place waiting for this 'cool person' to meet him... also she changed her clothes because it was too warm on the island