Question: pokemon heartgold how to evolve eevee into umbreon?
Answer: Level your Eevee between 8:00 PM and 4:00 AM. After your Eevee has a high friendship level, you will want to battle with your Eevee for it to level at least once. After leveling in the night time(8:00 PM - 4:00 AM), Eevee will evolve into Umbreon.