This guide will let you know where to catch Eevee in Pokemon Scarlet and Violet. You have to follow the simple steps below to catch it.
You will need to go to the south part of Medali to catch Eevee. Once you reach there, you will find an Eevee icon on the mini-map that means Eevee is just around here. You have to search around to find this pokemon, just roam around the area again and again and you might find one. Once you find one, it is recommended to put him to sleep and you will need Ultra Ball to catch it. You can breed the Eevee with Ditto.