First you have to get Eevee from Bebe. Then boost Eevee's happiness to the max. Then level it up and it will evolve.
level up eevee in the morning
to get one you raise eevee to max happiness during the DAY.
If you mean Espion (the psychic eeveelution) then find in Eevee in the Pokemon Mansion Trophy Garden and level it up when it's friendship is high enough between 8am and 4pm, it will then evolve into Espion. There is no Pokemon called Elspon sooo lol
I say they're the same because umbreon can beat espion and espion can learn psychic and it's very powerful but can't hurt dark types.
trian in day
gain friendship in day
Reason why Rizal suspected cause as a spy by Russian
to get an espion you have to give your eevee alot of love and care. The man dr footstep will tell you how much you Pokemon likes you. when it likes you ALOT go and level up your eevee. To get sn espion you must lv up in day and to get umbreon you must lv up at night
give it a dusk stone
Evolve Eevee, or trade.
Morning.
BY HAPPYNESS IN DAY IF IT is umbroen is in night