you can get another eevee as a prize in the Celadon Game Corner in kanto for 6666 coins, or you can breed it in the day care and hatch an egg.
you get it from bill in goldenrod city
No, you would have to transfer an Evee from one of your other games I.E. Heartgold soulsilver etc.
You can evolve an evee which you can find in Goldenrod city.
EVEE evolves at level 15
Defeat the Pokemon league and go to bills house. make one space in your party and he will give you Eevee
No because there is no clock in leafgreen you must trade evee to a game with an internal clock to make it evolve to evee those games are ruby, sapphire and emerald also heartgold, soulsilver, diamond, pearl and platinum.
In Pokemon HeartGold and SoulSilver, an Eevee cannot evolve into a Glaceon. You can trade with other trainers from Diamond, Pearl and Platinum to get one.
no you can not catch evee in pokemon yellow but someone will give it to you
nothing.
put it in day care with another normal type and hatch an egg(evee has to be female)
you go to azalea town
on mount silver