What would happen if a Eevee with 2 hearts in affection, a Fairy move, and max happiness leveled up at day/night near a mossy/Icy rock. Sorry if this is a stupid question, but it came to mind while I evolved my Eevee.
It would evolve into Leafeon/Glacion, depending on the rock. This is because Sylveon takes priority over Espeon/Umbreon, and Leafeon/Glaceon takes priority over Sylveon. Source: This and this