The next day, the Rhyhorn Races began, but it was interrupted as Team Rocket disabled the cameras. Serena became worried that something terrible might have happened to Ash, so she came along with Clemont and Bonnie to see what was going on. When they found him, they discovered that he had been ambushed by Team Rocket and they find him trapped in a net while his Pikachu and the Rhyhorn were trapped in cages. As Clemont used his Bunnelby to trap Team Rocket in a ditch, Serena and Bonnie arrived to rescue Ash. Serena used her Fennekin to fight off Team Rocket and make them drop the remote. This indicated that this is her first Pokémon battle in her journey as a Trainer. When Team Rocket was blasted off by the Rhyhorn they captured, she introduced her friends to her mother. She then tells her that she decided to travel with Ash and his friends. She thought her mother would disagree with her decision, but instead she said it would be a better experience for her. Afterwards, she gave her friends each a bag of cookies as a way of saying thank you to Ash for all he did for her.