It doesn't, but there is a way around this.
Trade.
If you cant, sorry man.
This goes for diamond, pearl, platinum. No way to catch first generation Pokemon (eg. Charmander, Pidgey, etc. but trading does the trick.
Yes they can i evolved my eevee on leafgreen, after you beat the elite four and have got both the runy and sapphire, you have a clock at home in pewter check that and if the clock is AM or PM you will know what to do, just keep on eye on the clock. Because my clock on it is the same time as it is in real life ;)
Ruby* i ment xDD
Train your Eevee at night and with happiness. It will eventually evolve into Umbreon.
Eevee doesn't evolve into Umbreon with a stone. Eevee evolves into Umbreon when it is levelled up with high happiness during the night.
To make Eevee evolve into an Umbreon, you have to level it up with high happiness at night.
friendship at night
You will need to have your Eevee to full Happiness, then level it up at least once during the night to evolve it into Umbreon.
Train your Eevee at night and with happiness. It will eventually evolve into Umbreon.
you have to raise eevee at night
Eevee doesn't evolve into Umbreon with a stone. Eevee evolves into Umbreon when it is levelled up with high happiness during the night.
To make Eevee evolve into an Umbreon, you have to level it up with high happiness at night.
friendship at night
You will need to have your Eevee to full Happiness, then level it up at least once during the night to evolve it into Umbreon.
in battles or evolve your eevee at night
Eevee doesn't have a set level to evolve into Umbreon. All you have to do to evolve it is max out its happiness at night. ~KKMG1
You receive an umbreon from evolving eevee. You need to befriend eevee and then engage in a battle (at night on the game) and it should evolve into a umbreon.
in the morning, after 8:00, you evolve eevee into espeon, at night, after 8:00, it evoles into umbreon (make sure eevee likes you alot)
Make Eevee as happy as you can. For Umbreon, level it up at night. For Espeon, level Eevee up in the day.
you cant you must evolve an eeve at night with max friendship.