To get another Evee you must breed an evolved Evee with a Ditto on Four Island in the Daycare Center. Once done walk around for a bit and come back you should be able to get an Egg from the Old Man now hatch this to receive an Evee.
That is not possible, if you go to four island and breed a evolved evee with a ditto you will get an egg inside is a evee use the other stones to get the other evee forms. BUT you still can't get espeon or umbreon you need to get one from ruby/sapphire or Pokemon colosseum or Pokemon emerald.
Noo...offcorse not !!! Suicune is a legend that does not evolve or has to be evolved Evee is a normal Pokemon that can grow to 7 forms i think depending which stone or where u go to do it ... -Starwest1
No you cannot evolve into or back to another form. I suggest if its a girl and your playing gold silver and the games that came out after it breed it with a ditto or get another eevee by trading from another game