No, Eevee does not have to evolve to breed.
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You will get an eevee egg. That you can evolve into an eevee or the other eevee evolutions.
Unfortunately, once evolved eevee can't evolve so sorry but for now you're stuck with leafeonnot necessarily. if you have another eevee that is a different gender from your leafeon or you have a diddo, you can breed them in the Pokemon daycare center and try again.
you cant evolve eevee into glaceon.
if i get eevee in level 20 what level eevee need to evolve into espeon
To make Eevee evolve into a Flareon, you have to expose it to a Fire Stone.