Go to Hearthome City and then go to the house to the right of the Pokemon center. Talk to Bebe, the lady in the house, and she will give you an Eevee.
You can also get it by going to the old masion in hearthome city!!! talk to balot and he will get it for you!! but it will take a long time!!!!!
You level up evee in eterna forest
evolving evee at night
trophy garden in platinum pearl and diamond
Trophy Garden.
who the hell cares!
in esmarelda city
EVolve an Evee from happiness at night time.
You do not need the national pokedex in platinum, simply talk to Bebe in Hearthome city
no Pokemon evolves with a fire stone in Pokemon platinum except eevee which turns in to flareon
you need to get an evee which bebe gives you in hearthome city. make evee friendly in the night by a berry,poffin,items and stuff
i have Pokemon soul-silver and i evolved my evee using a thunderstone
By getting EEVEE to a high friendship level at night.