Here is my Fakemon Swelshar which is based of of a swell shark with two forms: not inflated which has a higher speed and a lower defense and inflated which has a higher defense and a lower speed. It always starts out not inflated but it’s inflated form activates when it is hit but then inflated mode deactivates when it does not get hit for one turn when it it inflated. Then it evolves into Nurshar which is based of of a nurse shark and it only has one form. Both Swelshar and Nurshar are pure water types