As long as it is daytime, will my Eevee evolve into an Espeon even when training in a cave?

Question

It made me think, maybe its the sunlight that'd make Eevee evolve.

Answer 1

In some ways that would make more sense. But yes, if you're in a cave Eevee will still evolve into Espeon during the day.

Answer 2

During daytime, yes, EEVEE will evolve to ESPEON. But it's friendship must be high. Try giving it a Soothe Bell.