Umbreon

Snarl + Foul Play or Dark Pulse and Last Resort* or Psychic*

Snarl is recommended over Feint Attack for its very fast energy generation, though the latter does offer more damage output. 

Foul Play is usually the preferred move, due to its lesser energy cost, but Dark Pulse does provide some extra power for one or two more fast moves needed to charge it. Umbreon's lack of coverage moves is its liability, so while Community Day-exclusive Last Resort does cost more energy to use and is Super Effective against nothing, it's a must to deal neutral damage if the opponent would resist Dark-type moves. Psychic is an alternative coverage option added during the 2nd Eevee Community Day, and is preferable to retaliate against Fighting-type Pokemon, but risks Umbreon being completely resisted by other Dark-type Pokemon. 

Snarl + Last Resort* and Psychic*

This is a very specific set that requires at least one Elite Charged TM. It combines the perks of both of Umbreon's coverage options against its vulnerabilities versus Fighting-types and opposing Dark-type Pokemon. However without STAB Dark-type moves, Umbreon loses a lot of damage output against neutral opponents, and is also completely walled by common Steel-types.