how to evolve eevee to umbreon in let's go?
314400
won't be able to evolve. You can only obtain Generation I Pokemon (and Meltan and Melmetal) in the game, and the developers went to great lengths to make those evolutions that got tacked on later unavailable. So, in short - you cannot obtain Umbreon whatsoever in Let's Go.
621567
Eevee can't evolve into Umbreon or Espeon, actually, due to the absence of time in FireRed/LeafGreen. That means Umbreon and Espeon both have to be traded from R/S/E to be obtained in FireRed/LeafGreen.
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Welcome to Gaia! :: In order to evolve your Eevee into Umbreon, you first need to raise it's Happiness, then evolve it at night. There are also berries that will increase your Poke's happiness at the expense of EV's; they're best used when the Poke first hatched so it doesn't have any EV's to lose.
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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.
751997
Unfortunately Jolteon, Flareon, and Vaporeon all evolve randomly from Eevee. However, Umbreon, Espeon, Glaceon, and Leafeon have alternative methods. Umbreon and Espeon both evolve after walking with the Eevee as your buddy Pokémon for 10 kilometers.
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Eevee doesn't evolve at any specific level. The only way to evolve it via leveling up, is to max out its friendship and raise its level.
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Whether you picked up Pokémon Let's Go Pikachu or Pokémon Let's Go Eevee, you can add your very own Eevee to your Pokédex and you can evolve it into one of the three elemental types; water, fire, or thunder. Once evolved, Eevee will become either Flareon, Jolteon, or Vaporeon.
160771
Level up Eevee at during the day (Espeon) or during the night (Umbreon) once you think its Friendship is at 220. Once you feel that Eevee is above 220 Friendship, level it up during the day to evolve it into Espeon, or at night to evolve it into Umbreon.
199552
Rename Eevee as Tamao to evolve into dark-type Umbreon. Rename Eevee as Rainer to evolve into water-type Vaporeon. Rename Eevee as Sparky to evolve into lightning-type Jolteon. Rename Eevee as Pyro to evolve into fire-type Flareon.
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Open up your Pokemon collection and find an Eevee that's spare. Change the name from Eevee to the codename - so that's Linnea (for Leafeon) or Tamao (for Umbreon) for example - by tapping the pencil next to that character's name. Hit the evolve button and your Eevee will change into the evolution of you choice.
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['Eevee Evolve Into Vaporeon, using Power Stones to have your HP higher than your Attack when you hit Level 36.', 'Eevee Evolve Into Flareon, using Power Stones to have your ATK stat higher than your HP when you hit Level 36.']
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So far, Pokémon Go has added Eevee evolutions for the first four Generations of creatures, which means Eevee can only evolve into Leafeon, Glaceon, Umbreon, Espeon, Flareon, Jolteon and Vaporeon for now. That leaves just Sylveon to go.
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You need to level eevee up at night time with full happiness then it evolves to umbreon.
512055
If you want to evolve it into Jolteon, Vaporeon, or Flareon, press X, go to bag, select thunder, water, or fire stone, and press A and select use. Select Eevee, and it will evolve.
1317135
Ok so you can evolve eevee into three versions in this game,flareon the fire type by using the fire stone on eevee,jolteon the electric type by using the thunder stone on eevee,vaporeon the water type by using the water stone on eevee.
282895
So far, Pokémon Go has added Eevee evolutions for the first four Generations of creatures, which means Eevee can only evolve into Leafeon, Glaceon, Umbreon, Espeon, Flareon, Jolteon and Vaporeon for now.
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General Advice. Eevee generally evolves into Espeon or Umbreon if it levels up when its happiness (or "friendship") value is 220 or more.