Things You'll Need
Instructions
Making Eevee Eggs
Obtain the first Eevee as a gift or in a trade. In Generation II games like Gold and Silver, receive Eevee as a gift from Bill. In Generation IV games Diamond and Pearl, get Eevee from Bebe, or find one in the Trophy Garden. In generations after Generation II, the only option is to get an Eevee in a trade with another player.
Catch another Pokemon in the Field breeding group. Eevee can only breed with other Pokemon in the Field Egg group. Common, easy-to-find options include Rattata in Generation II, Poochyena in Generation III, Stunky in Generation IV, and Patrat in Generation V. Make sure the second Field Egg group Pokemon is the opposite gender from the original Eevee.
Leave both the Eevee and the Field Egg group Pokemon in the Pokemon Daycare. Put both Pokemon in together so that they can breed.
Walk around to give the Pokemon time to breed. How quickly they breed depends on the personalities of the Pokemon. Check with the Daycare Man frequently until he gives you the Eevee egg he found.