Yes.
after you get the national poke'dex go to the Pokemon mansion on route 212 [under hearthome city go to the mansions owner mr. backlot and he should say a tupe of Pokemon is in his trophy garden [he should say eevee one time] go walk in the garden and eevee should apper
well either go to the mansions garden and if you've beat the elite 4 the owner will tell you what Pokemon is in his garden and when eevee go through grass and when see him catch him/her...
if you get Pokemon platinum or diamond, then after you beat the Pokemon league, go to the trophy garden on route 212 and talk to the owner. everyday, there is a rare Pokemon in the garden, eevee being one of them.
No, you must have the National Pokedex to see Eevee in the Trophy Garden. Once you receive it, you can talk to Backlot and he will tell you which special pokemon showed up in the garden that morning. At some point, he will tell you that he saw an Eevee in the garden, then you can go into the garden and find Eevee.
in trophy garden after getting nat. dex
At the end of the game, new Pokemon appear in the trophy garden. one hint. max repels and a pokeradar.
in Pokemon platinum to get a second or more eevees you have to have a notional dex. then go to mr. backlot's mansion and talk to him. somethimes he will say an eevee is in his tropy garden but not always
breed it with a ditto (which i think u can find by canalave) or catch one in the trophy garden.
sinnoh pokedex: #163 is eevee. you can find eevee in Mr.Backlot's garden. (depending on the Pokemon of the day) National dex: #133 is octillery. i don't know where to find it. Sorry!
no you cannot get an evee in the trophy garden but you can get one in the pastoria city. go and talk to bebe she will be in the house beside the pokemart
a lady in a house next to the Pokemon center will give you an eevee
Eevee is in the trophy garden.[Don't worry I've caught one]