Eevee is giving to you at Level 10 by Bill in Goldenrod city after you beat Whitney. Using stones, it can evolve into Jolteon, Flareon, and Vaporeon. If it is happy at night, it'll evolve into Umbreon. If it is happy during day, it'll evolve into Espeon. These are all good Pokemon for your team.
Eevee is given to you by Bill. First, you must find Bill working in Ecruteak City. From there, he will go back to his house, located in Goldenrod. Talk to him and he will give you an Eevee.
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In Pokémon HeartGold and SoulSilver, Professor Oak will give you the National Dex at the port in Olivine City if you have defeated the Champion of the Pokemon League. You also need to go to Prof. Elm and defeat the Kimono Girl's, all of which have evolutions of Evee.
To get vaporion give evee a water stone.to get flerion give evee a fire stone. to get joltion give evee a thunther stone and that is all for Pokemon leaf fire and and water
There is no best Pokemon on Pokemon HeartGold.
evee
Evee is not availiable in Pokemon Sapphire.