It doesn't depend on the level. You build up it's friendship level (feed it lots of status drugs, don't let it faint a lot, and let it be in the beginning of lots of battles) in the night time.
You have to get eevee to max happiness and level him up during night.
No, Umbreon does not evolve. It is one of the final stages of Eevee.
In Pokemon Gold/Silver you need to found Bill in his house.
evolve it with happiness and make the evolution start at night
There's Eevee, Glacion, Leafion, Joltion, Flarion, Espion, Vaperon, and Umbrion. So there are 8 forms.
same way youd get it on another version eevee happiness level up after 10pm
You have to play with eevee in the day.
train your eevee in the afternoon
When Eevee loves you, level it up in the Morning.
Level up an Eevee with a high friendship in nighttime. You get an Eevee from Bill
eevee
It cant