Eevee CAN envolve into 2 pokemon without using a stone but this requires a few things. Make sure it fights in alot of battles and use the soothe bell. The pokemon it can evolve into via happiness are Umbreon and Espeon. Umbreon is dark and Espeon is psychic.
They both evolve at a certain time though. Umbreon at night (6:00pm to 5:00am and espeon in the day (5:00am to 6:00pm. Both of them need to friendly toward you. There is no level that they need to involve on as long as they are really friendly. If you don't know, go to Goldenrod City and one of the buildings has a lady in there that will tell you if your pokemon is friendly towards you or not.
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In Pokémon HeartGold, you can only evolve Eevee 5 ways which would be: Using a Fire Stone on an Eevee into to evolve it into a Flareon, use a Thunderstone on Eevee in order to evolve it into a Jolteon, use a Water Stone on Eevee in order to evolve it into a Vaporeon, evolve it into Umbreon via level-up at night (which is between 8PM and 4AM) when it's happy enough and evolve it into Espeon via level-up during the day time. You can also evolve Eevee into Glaceon and Leafeon however evolving Eevee into Glaceon or Leafeon is not possible in "HeartGold" or "SoulSilver," Eevee can only evolve into Glaceon via level-up when it's near the Ice Rock which can only be found in the Sinnoh region near Snowpoint City and Eevee can only evolve into Leafeon when it's near the Moss Rock which can only be found in the Sinnoh region which is in the Eterna Forest.
It's really up to you -- depending on how long you want to deal with Eevee's Normal type, before you evolve it into one of the Eeveelutions. The most powerful move it will learn, as an Eevee, is Take Down, (which has an attack of 90.) That would be level 42. So that's probably the best level to evolve it at.
you use a fire stone on eevee to evolve it into flareon thunder stone = jolton water stone = vaporeon full happenes in day you get espeon night time you get umbreonYou cannot evolve an Eevee into a Glaceon in Pokémon HeartGold, you would have to trade it to either Pokémon Diamond, Pokémon Pearl or Pokémon Platinum and evolve it into a Glaceon there and then trade it back to HeartGold.
Shiney eevee would evolve into a shiney flareon.
as soon as possible~It's really up to you -- depending on how long you want to deal with Eevee's Normal type, before you evolve it into one of the Eeveelutions. The most powerful move it will learn, as an Eevee, is Take Down, (which has an attack of 90.) That would be level 42. So that's probably the best level to evolve it at.Read more: When_is_the_best_level_to_evolve_eevee