The way is to obtain the National Dex, then go to Bebe's house. She lives in the house next to the Pokémon Center in Hearthome City. She will give you an Eevee and say it was from her friend Bob in Kanto and that he has a Eevee farm.
If you want more Eevees (which would be useful to see every evolution of it) breed the one which you got from Bebe and breed it with a Ditto (found on route 218 with a Pokéradar). If you keep them in there, after a while you'll find an egg at the Day Care center in Solaceon Town.
Breeding (in the DayCare Center in Solaceon Town):
Eevee + Ditto = Eevee
Eevee + another Eevee of the opposite gender = Eevee
Eevee + any evolution of Eevee of the opposite gender = Eevee
Any Eevee evulution + Same eevee evulution opposite gender = eevee
Eevee can also breed with certain other Pokemon like Glameow, Buneary, Bibarel, Chimchar, Piplup, Ponyta, Pachirisu, and other Pokemon in the Ground Egg Group, as long as they are of the opposite gender.
And if you breed an Eevee with the female gender and a Ditto, it will still have the same gender rate (12.5% of Eevees are females when hatching from eggs). I'm speaking from experience here.
More females are found in the wild than from eggs in Pokémon Pearl (speaking from experience - I am not sure about the other game, Platinum, but it seems to be this way in Diamond and Pearl.)
To get them in the wild, speak to Mr. Backlot in the Pokémon Mansion south of Hearthome City after you get the National Dex. Save before you speak to him. If he says that an Eevee ran up an gave him a smooch, then you can use your Pokéradar to find one in the Trophy Garden. If not, then turn off your DS and speak to him again until he says that there are Eevees in his Trophy Garden.
This Trophy Garden trick works in Pokemon Diamond and Pearl, and probably Platinum.
After you get a free eevee on rt 212 go into the trophy garden and talk to two men in the masters ofice and one will say about a rare Pokemon running up to him in the garden so go there and you will find one of that rare Pokemon there will be a diffrent Pokemon evry day. If you cant wait just save your game and change your time to 1 minuet to midnight and wait a minuet and it will be a diffrent Pokemon.
Hope this helps
"p.s easyer with poke radar"
If on platinum, you can have an Eevee off Bebe as soon as you reach Hearthome City. Beat the elete four, then go to bebe's house (i dunnno were she lives.. but the's the PC woman(like bill and lannete before her. and then she will give you a eevee
1. Get the national pokedex and go to Hearthome City. Go to the house next to the Pokemon center. The girl inside will give you a free level 5 Eevee!
2. Go to Trophy Garden ( I'ts REALLY RARE!)
fill the sinnoh dex. after that go talk to the profesor.then go talk to bebe. she gives you it
You need your National Dex first. Then go to Hearthome and go into the house next to the Pokemon Center. A Battle Girl named Bebe who runs the PC system will greet you, congratulate you on your completion of your dex, and give you a level 5 female Eevee. Not only that, it doesn't say someone's PC anymore, it says Bebe's PC. Breed Eevee with a Ditto and you will get a lot of Eevees. I did this, and I now have Umbreon, Espeon, Jolteon, Vaporeon, Flareon, Glaceon, and my favorite- the one from Bebe- a level 54 Leafeon! :]
Get your national dex then either get one from bebe in hearthrome city or catch one south of there in the trophy garden of the Pokemon mansion
There are actually 2 ways to get Eevee(s). One way to get an Eevee is to go to Hearthome City and go to the house beside the Pokemon Center and talk to Bebe when you have the National Pokedex. Another way is to go to the Pokemon Mansion and talk to the owner, he'll tell you there are cute Eevee in his Trophy Garden, and just walk around till you encounter one, you can get a lot of them by this. FYI: You can also get Castforms and Meowths and Miltanks by walking in the grass!
in the trophy garden at the bottem of paostoria city
go to bebe house i n hearthrone city it is next to the Pokemon centre (the sinnoh pokedex is required) or go to the Pokemon mansion talk to mr backlot he will say there are Pokemon in his garden keep trying soon he will say eevee then rush into the garden and find one.(it is simpler than it seems just try once a day if mr backlot does not say eevee are in his garden)
After you get the National Dex
of corse
You have to get it from a friend who has Pearl/Diamond/Platinum
It takes 9,180 steps or 36 Egg Cycles to hatch an Eevee.
A total of three Pokemon evolve using the Fire Stone: Vulpix, Eevee, and Growlithe.
eevee in lefeon
you can evolve eevee and gloom
In Pokemon Diamond and Pearl you can receive Eevee from Bebe in Hearthome city.
Kindness to eevee at daytime.
Eevee
go to hearthrome city and go into the house next to the pokemon center There is a girl in there and she will give you the eevee
Eevee Growlithe Vulpix
Yes you can. Since both Glaceon and Ditto are breedable Pokemon. You can also breed any Eevee evolution as well as Eevee with Ditto to get an Eevee.
Use a thunderstone.
get the national dex
After you get the National Dex
of corse