The only surfire way is to keep restarting until you get one. But shinies are very hard to get.
Chat with our AI personalities
a lady in a house next to the Pokemon center will give you an eevee
The trainer Skier Lexi on Route 217 has Eevee's evolution in Pokemon Platinum. The trainers on Route 212 and 214 also have Eevee.
in kq
You use a water stone on your Eevee.
...shiny Pokemon are always shiny... ._.