I was breeding Sandygast the other night for some Battle Tree Pokemon. Barely paying any attention when hatching eggs and I looked down to advance some menus and lo and behold there she was. I was breeding for a Bold nature (-Atk +Def) when it happened and I just so happened to get Calm (-Atk +SpDef), which works too. Thankfully she also has good IVs. 31s in HP, SpAtk, Def, and SpDef.
Right then and there I hatched the last egg and stopped breeding Sandygast.