How can you get espeon in Pokemon ruby destiny rescue rangers?

To obtain Espeon in Pokémon Ruby Destiny: Rescue Rangers, you need to evolve an Eevee. First, ensure your Eevee has high friendship levels, which can be increased by walking with it, battling, and using items like vitamins. Once its friendship is high enough, level it up during the day to trigger its evolution into Espeon. Make sure to check the in-game time, as it must be daytime for the evolution to occur.