Here's all the ways to evolve Eevee currently:
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Eevee can evolve with maximum happiness which will cause it to evolve into Espeon if it evolves up during the day, it can also evolve into Umbreon if it levels up during the night time with maxed happiness additionally you can use a Fire Stone, Water Stone or Thunder Stone to evolve it into either Flareon, Vaporeon or Jolteon respectively or you also have the option of leveling it up near a Moss Rock to evolve into Leafeon, leveling it up near an Ice Rock to evolve it into Glaceon or you could also evolve it into Sylveon as long as it knows a Fairy-type move as well as has at least a minimum of 2 affection hearts in Poke-Amie.
No, Eevee does not have to evolve to breed.
you cant evolve eevee into glaceon.
if i get eevee in level 20 what level eevee need to evolve into espeon
To make Eevee evolve into a Flareon, you have to expose it to a Fire Stone.
No, Eevee does not evolve with a Shiny Stone. Only Togetic, Roselia, and Chillarmy evolve with it.