Description: Start with a Curse to boosts Umbreon's Attack and Defense (which works really well with it's already high Special Defense). Payback is probably the best STAB move for an Umbreon to use (other than Foul Play but that's based on your opponent). Payback gets the STAB bonus and doubles in power if Umbreon uses it after it gets hit (which is probably going to happen considering Umbreon's low Speed thanks to Curse).
Options: Rest and Sleep talk combo are another decent combination to use although you lose some control. Rest to recover your HP and reset your status, then with some luck Sleep Talk your way to victory.
I was debating the Assault Vest option to boost it's Special Defense along with maybe using a Relaxed-nature to help reinforce it's current defense but i'll have to play around with the idea more.
This is a good moveset for umbreon (Pokemon #197) with the synchronize ability/trait, a Sassy nature, and equipped with Leftovers submitted by Cybermewtwo. For use in competitive Pokemon battles featuring an Export option and breeding guide.