Celebi quest: A Ripple In Time 4/8 Complete!
How to evolve Eevee into Espeon in Pokemon Go:
Make Eevee you buddy. Do not swap buddies while you are walking with Eevee.
Walk 10 KM with Eevee. This will earn you 2 Eevee candy.
When you have walked that much, while keeping it as your buddy, Evolve your eevee when the overworld is in the day phase. You will get your Espeon and complete the quest!