If you breed an Eevee with a Ditto, then you can evolute the hatchlings into the other forms
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You will get an eevee egg. That you can evolve into an eevee or the other eevee evolutions.
Isshu doesn't have any new Eevee evolutions but Eevee is capable of evolving into any of the previous evolutions which includes Glaceon and Leafeon.
With a other Eevee, one of its evolutions, or a ditto.
Yes. You can also find various other stones to evolve Eevee into other evolutions.
Pokemon LeafGreen does not have a time system. This makes it impossible to do evolutions that involve time such as evolving Eevee into Espeon or Umbreon.