Finding Finemo

Premise
Out on the coral reefs in Alola, a Finemo lives in her reef home with her best friend, also a Finemo. She is traumatized by a Sharpedo attack years before that killed her mate and permanently injured her daughter's right fin. But then, she is captured by a dentist and presented to his creepy daughter as a gift. Will Elizabeth (turned into a Bruxish) and Dragonet rescue her, or else?