Well, first things first, Umbreon has higher Atk than sp Atk, yet all of your attacks are special. You'll need to replace them with offensive attacks. Dark Pulse can be replaced by Payback, which does a lot more damage than DP when it hits last. The other attacks don't really give you anything, you could replace thesm with Toxic/Taunt/Yawn/Protect/Mean Look. I suggest Toxic as one, but the other is really your choice. Having Moon Light is very lucky, I tried for ages to breed for that but couldn't. You should definetly keep it!
Hope this helps!