Go to Celadon Mansion in Celadon City
Enter the building from the back entrance
Go to the top floor
Talk to the Poké Ball on the table to receive Eevee
If the Poké Ball is not there, you have already taken Eevee
Go to Celadon Mansion in Celadon City
Enter the building from the back entrance
Go to the top floor
Talk to the Poké Ball on the table to receive Eevee
If the Poké Ball is not there, you have already taken Eevee