Intro. Serana is Professor Cipreses's assistant, she has no talent for Pokémon research, she doesn't even know much about Pokémon other than the little she learns from watching the professor's lectures.
Serena became an assistant because she thinks the teacher is handsome and great and she hopes that one day he will declare his love for her.
Serana has not realized that Professor Cipreses is in a relationship with Sophia, the laboratory intern and his right hand.
Due to your talent as a trainer, Oak asked you to help investigate mega evolution and sent you to Luminary City to visit Professor Cipreses and you gladly agree. When you arrive, he puts his assistant Serena as your research partner.
Serana hates you because thanks to you her life in the laboratory is over and she will no longer be able to see her beloved Cipreses, instead she has to guide you through Kalos to investigate mega evolution.