Sally was a young girl who first introduced herself to Ash and his friends after they rode the water taxi she and her father ran together. The taxi took travelers to Castelia City. She was friends with a Gothitelle who helped her serve juice to the passengers. She explained that their taxi business would end soon as soon when the Skyarrow Bridge would be finished.
The young Sally that Ash met was merely an illusion created by Gothitelle. The real Sally was actually a woman whom he met earlier at a Poké Mart. Like the group, she also tried to cross the Skyarrow Bridge, but she became lost in Gothitelle's illusion. She eventually came across Gothitelle and tried to stop it from attacking the group. Everyone was shocked by this, and Sally had to explain everything.
When the Skyarrow Bridge was built, her father was forced to shut down his water taxi business because it would no longer be needed. Sally invited Gothitelle to come live with them and help run a restaurant. When Sally grew up, she left her home and Gothitelle behind to become a doctor. Gothitelle was upset by this and left one day. Sally explained to Gothitelle that while their life was wonderful, they could not keep living in the past. Then, she promised to come by and visit when she visited the Skyarrow Bridge again. Content with this, Gothitelle mysteriously disappeared after saying goodbye to Sally.
Gothitelle is a good friend of Sally's ever since she was a little girl. It helped her and her father run a water taxi business before the creation of Skyarrow Bridge. It went to live with Sally after her father's ferry business was shut down. Sally eventually grew up and left the house. Gothitelle was saddened when she left and traveled back to Skyarrow Bridge.
Gothitelle created a fog around the bridge to deter people from crossing. Still, Ash, Iris, and Cilan crossed it anyway and it attacked them. It then created the illusion of its old life with Sally and her father. The group was confused when they saw the same Gothitelle who attacked them earlier being nice and friendly towards them. While the illusion was convincing, Cilan knew something was amiss.
Later, back in the present time, they followed Gothitelle to Skyarrow Bridge where it attacked them once more. That's when the real Sally showed up to stop it. Gothitelle was happy to be reunited with its old friend and cleared the fog from the bridge, letting Ash and company cross. It then mysteriously disappeared.