Name: Umbreon
Type: Dark
Ability: Synchronise
Evolve Eevee
Eevee -----------> Umbreon
Happiness
Stats:
HP: 95
Attack: 65
Defense: 110
Special Attack: 60
Special Defense: 130
Speed: 65
Moves:
Level up (Generation IV)
Tackle - Start
Tail Whip - Start
Helping Hand - Start
Sand Attack - 8
Pursuit - 15
Quick Attack - 22
Confuse Ray - 29
Faint Attack - 36
Assurance - 43
Last Resort - 50
Mean Look - 57
Screech - 64
Moonlight - 71
Guard Swap - 78 (HG SS only)
TM/HM:
Toxic - TM 06
Hidden Power - TM 10
Sunny Day - TM 11
Taunt - TM 12
Hyper Beam - TM 15
Protect - TM 17
Rain Dance - TM 18
Frustration - TM 21
Iron Tail - TM 23
Return - TM 27
Dig - TM 28
Psychic - TM 29
Shadow Ball - TM 30
Double Team - TM 32
Torment - TM 41
Facade - TM 42
Secret Power - TM 43
Rest - TM 44
Attract - TM 45
Snatch -TM 49
Endure - TM 58
Payback - TM 66
Giga Impact - TM 68
Flash - TM 70
Psych Up - TM 77
Captivate - TM 78
Dark Pulse - TM 79
Sleep Talk - TM 82
Natural Gift - TM 83
Dream Eater - TM 85
Swagger - TM 87
Substitute - TM 90
Cut: HM 01
Strategy:
Curse
Moveset: Dig, Payback, Curse and Moonlight
Nature: Adamant/Impish
Item: Leftovers
EV's: Attack, Defense and HP
This is not the best moveset but by no means bad either.
Curse boosts Defense and Attack, while Dig can help counter Steel types (Except Skarmory), Payback is also good here since it does double damage when attacking after the opponent and Moonlight can heal you. Wish is also reccomended
Toxic away
Moveset: Toxic, Protect, Wish/Moonlight and Payback
Nature: Sassy
Item: Leftovers
EV's: Attack, Defense/Special Defense and HP
Much better moveset.
Toxic can drain down the opponent, while you can use Protect to protect yourself. Moonlight heals you and Payback can be used for attacking, just remember to lower your speed a bit for more powerful Payback.
Final: Umbreon is good but lacks a good moveset, its main problem is Steel types, although it can learn Dig and Mud-slap, It cannot beat defensive Pokemon like Skarmory or some Pokemon with Magnet Rise.
Umbreon can be hard to kill but its moveset is poor, making it seems worthless compared to Blissey
It is more recommended then Dusknoir due to its higher HP
If your looking for a Defensive Pokemon, go for Umbreon, just be careful with Steel types.