Since many pokemon trainers have asked about this, I've decided to write a mini guide on how to breed lots of eevees. Feel free to reply with more suggestions.
Why would you want to breed lotsa eevees? whats so special about an eevee
Well an eevee has 7 forms (evolutions):
Espeon
Flareon
Glaceon
Jolteon
Leafeon
Umbreon
Vaporeon
Plus of course, cute eevee itself. Since you can evolve a eevee only once, if you want to get all the evolutions, you need to get more eevees.
What you need for this is:
Female eevee
Day Care Center app
A pokmeon with HM Fly
How do I get an eevee?
Find Bebe in Hearthome City. She is in house to the right of pokemon center. She will give you an Eevee. IMPORTANT: SAVE YOUR GAME BEFORE GETTING THE EEVEE FROM BEBE. You want to get a FEMALE eevee. if she gives you a male eevee, just reload your saved game and try again.
If you missed that chance and do not have a female eevee, than that youll have to either trade for an eevee or get another one at trophy garden after acquiring the national pokedex.
Note: A Ditto and a male eevee will also work
How do I get day care center app?
You get it from the day care center in Solaceon city
How do I get HM Fly
You will find it in a warehouse in veilstone city.
Once you have everything, put the female eevee in day care center along with a pokemon of the same egg group. The following pokemons should mate with a female eevee:
Absol Aipom Ambipom Ampharos Arbok Arcanine Bibarel Bidoof Blaziken Buizel
Buneary Camerupt Chimchar Combusken Cyndaquil Delcatty Delibird Dewgong
Diglett Donphan Dugtrio Dunsparce Eevee Ekans Electrike Empoleon Espeon
Exploud Farfetch'd Flaaffy Flareon Floatzel Furret Girafarig Glaceon Glameow
Golduck Granbull Growlithe Grumpig Hippopotas Hippowdon Houndoom
Houndour Infernape Jolteon Kecleon Leafeon Linoone Lopunny Loudred Lucario
Luxio Luxray Mamoswine Manectric Mankey Mareep Mawile Meowth Mightyena
Miltank Monferno Nidoking Nidoran Nidorino Ninetales Numel Nuzleaf
Pachirisu Persian Phanpy Pikachu Piloswine Piplup Ponyta Poochyena Primeape Prinplup
Psyduck Purugly Quagsire Quilava Raichu Rapidash Raticate Rattata Rhydon
Rhyhorn Rhyperior Sandshrew Sandslash Sealeo Seedot Seel Sentret Seviper
Shiftry Shinx Skitty Skuntank Slaking Slakoth Smeargle Sneasel Snubbull
Spheal Spinda Spoink Stantler Stunky Swinub Tauros Teddiursa Torchic Torkoal
Typhlosion Umbreon Ursaring Vaporeon Vigoroth Vulpix Wailmer Wailord
Walrein Weavile Whismur Wooper Zangoose Zigzagoon
If you talk to the day care center he will most likely tell you that "the two dont really seem to like each other that much". This is ok they will still mate an egg. If he tells you that "they prefer to play with other pokemon" then it means that you put the wrong pokemon to breed.
After you've left the female eevee and male pokemon in the day care center, deposit all your pokemon EXCEPT the one with hm fly in Bebe's PC.
Now fly to Eterna City, get on your bike, and go south to oute 206 Sinnoh Cycling Road. Load the day care center app on the poketch, and start cycling up and down. You will roll down by yourself, all you have to do is go back up every time you reach the bottom.
After a little bit you should see in day care center app that an egg is ready. Go back to the daycare center, pick it up, then go back to the cycling road. Ride your bike for a bit more and another egg should appear, go pick it up then again return to cycling road and keep riding bike up and down. Keep getting eggs, and also eevees will start hatching sooner or later. store hatched eevees in PC and then pick up more eggs.
how much time this will take
Probably a couple of hours, depending how many eevees you want.
Now that I got all those eevees, how do I evolve them to all the forms?
Espeon: Level durng the day (with max happiness) 4am to 8pm
Flareon: Use a Fire Stone
Jolteon: Use a Thunder Stone
Vaporeon: Use a Water Stone
Umbreon: Level during the night (with max happiness) 8 pm to 4 am
Leafeon: Level buy the moss covered rock in Eterna Forest
Glaceon: Level buy the ice covered rock near Snowpoint city
Good luck breeding lotsa eevees!!