My Eevee evolved into an Espeon on route 9, so I immediately went back to my last save. How do I force Glaceon-ity onto my Eevee?
In Sword/Shield, Eevee evolves into Glaceon with an Ice Stone. Here's a list of Ice Stone locations. It evolves into Espeon after leveling up with high friendship, so be sure not to raise it's friendship too much before getting the Ice Stone.