Route 34: This is the most common location to find Eevee. It's a relatively early encounter, making it a great option for trainers looking to build their team.
Route 36: Another option for finding Eevee, but it's slightly less common than Route 34.
Goldenrod City (after obtaining the Silver Badge): You can find Eevee in the grass surrounding the Goldenrod Department Store.
Ilex Forest (after obtaining the Silver Badge): Eevee is a rare encounter in Ilex Forest, but it's worth checking out if you need one.
Note: All of these locations have a relatively low encounter rate for Eevee, so you might need to spend some time searching.
Tips for finding Eevee:
* Use the "Sweet Scent" TM: This TM increases the chance of encountering a Pokemon, including Eevee.
* Use the "Poké Radar": The Poké Radar can help you locate specific Pokemon in the grass, including Eevee.
* Be patient: Finding Eevee can take some time, so don't give up!
Good luck finding your very own Eevee!