So I have been trying to solve this little enigma for a while /vp/. how does one change or obtain the different forms of Sawsbuck? I have only been privy to the spring form, and I've tried hatching and battling my Deerling/Sawsbuck all over Kalos. I know for sure the alternate forms are obtainable as I've seen screenshots of gen 6 winter and fall Sawsbuck, but the people who obtain those have no idea how to get the spring forms. does anyone on /vp/ have any idea?

Sawsbuck is one of my favorites for sure and I would appreciate input.