Pokemon blue is a 1st generation game. Espeon is a second generation pokemon. This means it didn't exist in blue.
You evolve an Eevee into and Espeon by raising it to max happiness. Pokemon gain happiness when you give them massages (in Goldenrod underground and Blue's sister.) It will take a while to reach max happiness. Then you level it up in the day. It will evolve into Espeon.
Espeon is the psychic evolved form of Eevee. It is a psychic pokemon.
Espeon cannot evolve.
Route 30
umbreon and espeon
no, it can not
Espeon.
Cheating.
Evolve it from eevee
You can't get espeon in leafgreen so trade one from Pokemon colosseum or ruby, sapphire or emerald or Pokemon xd gale of darkness.
i don't think you can without the Pokemon modifier code
Yes in shoal cave.