How do you get Espeon on Pokemon Platinum?

In order to get your Eevee to evolve into an Espeon, you need to train it until it reaches its maximum happiness. However, this has to be during the day time (10 AM - 6 PM) in order for it to evolve into Espeon (night time is for Umbreon). If you do not have an Eevee, you can get one from Bebe in Hearthome City or in the Trophy Garden on route 212 as your daily Pokemon once you have obtained the National Dex. Simply go into the mansion and talk to Mr. Backlot. He will let you know which special Pokemon is in the garden for that day.