We need an argument here!
Is Umbreon Black, or Dark Black? Hahahahahaha...hah...ahah...haa....v_v
People from the Espeon FC would know about that crap...
Anyways. Well, I guess I really didn't answer the topic question that well:
What would you do if your Umbreon didn't like you?
I would run for my life O_O
So I shall answer it now. I'd try to figure out why it doesn't like me. Since I'd have it with me, I'd train it a whole lot, and if it's immediately that it didn't like me, I can probably tell that it either just doesn't like me as a trainer, or humans in general, I'd try to show it that us humans aren't as bad as it may think we are. If that's not the case and it started randomly one day, or something I can figure out (let's say the way I would go about training it) I'd think back to when it was happy and just go back to that sort of thing. Of course, if Umbreon existed and there was a freaky threatening red-eyed black dog growling at me, I'd run for my life, and hope it doesn't chase me.
Oh god... bad childhood memories....
Okay, I'm better. Okay, now THAT'S my real answer.