I have a similar problem, except I can only find Spring Form Deerling. I got the Spring Form from the Malchous egg event, and the wild Deerling in Chrysolia and Route 1 are all Spring Form as well. I tried changing the time of day I was hunting in, then changed the date on my computer to see if that would work, but it didn't. Even changing the year didn't seem to help. Does anyone know how to affect which Deerling forms you can access? The Fandom Wiki says there should be an equal chance of encountering Spring or Summer Forms in these early areas, but they don't explain how the game decides what you'll get.