Who are the trainers that have an umbreon in Pokemon HeartGold?

If you want to battle a trainer, go to Pastoria City keep going left if u see a fat trainer whatever he is go in front of him or talk to him. If you want to get one it's pretty hard unless someone in your house has one and is willing to give it to you but then if you go to the GTS (Global Trade Station) in Jubilife City then it's harder than you think.