I've seen Umbreon being used in the metagame quite usually, but I've been thinking about a strictly starter Umbreon, only to use as your first Poké. It's something like this:
Mean Look
Rest
baton pass
torment / substitute
You take out Umbreon on something like a Salamence, Swampert... which expects Umbreon to be a Toxicer or subpasser, and you mean look them before they realise it's not. you can also use torment or substitute, then baton pass to the right Pokémon. If you've Mean Looked something physical, bring in something with a lot of defense, for example. Then, you start setting up. If you did the switch well, your newly come Pokémon should be strong against the Mean Looked one, so you can set up safely, and rest off the damage if you need it. That way you can get in 6 Calm Mind or 6 Bulk Up / Dragon Dance with not much of a problem.
It doesn't always work but it's got a good success percentage. What do you think about it?