How do you get umbreon in platinum?

Answer 1

u must make friends with your eevee at night time. if u don't have eevee then go to hearthome city and talk to the lady in the house next to the Pokemon center. if u already did that then get the national pokedex after seeing all sinnoh Pokemon. go tto Pokemon mansion and save the game. talk to mr blacklot and he tells about a Pokemon in his trophy garden. if its not eevee, turn the game off and keep trying until he mentions an eevee.

Clearing up some fog...

To make it happy you can give it Zincs, HP Ups, stuff like that. A girl in Veilstone will give it a massage. Give it poffins it likes. (You make poffins in Hearthome.) After you think (or check the Pokefriend App thing XD) that its happy enough (2 hearts on the App) You level it up (yes, rare candies work too) and it should evolve!

Hope I helped!!

Found most of it out by my self..