My Platinum Team

I've played Platinum for a couple weeks now, and I have a new team (no particular order--this is purely an Ingame/Battle Frontier team right now):

Gliscor (Ability: Hyper Cutter)
Nature: Impish
Item: Yache Berry
EVs: 196 Speed/160 HP/92 Attack/60 Defense
-Earthquake
-Thunder Fang
-Roost
-Stealth Rock

Crobat (Ability: Inner Focus)
Nature: Jolly
Item: Black Sludge
EVs: 252 HP/216 Speed/40 Attack
-Pursuit
-Haze
-U-Turn
-Brave Bird

Starmie (Ability: Natural Cure)
Nature: Modest
Item: Choice Scarf
EVs: 252 Speed/252 Sp. Attack/4 Defense
-Surf
-Ice Beam
-Psychic
-Rapid Spin

Umbreon (Ability: Synchronize)
Nature: Sassy
Item: Leftovers
EVs: 252 HP/252 Attack/4 Sp. Defense
-Curse
-Payback
-Wish
-Taunt

Dusknoir (Ability: Pressure)
Nature: Adamant
Item: Shell Bell
EVs: 252 HP/80 Defense/160 Sp. Defense/16 Attack
-Shadow Punch
-Pain Split
-Will-O-Wisp
-Brick Break

Ninetales (Ability: Flash Fire)
Nature: Timid
Item: Wide Lens
EVs: 252 Speed/252 Sp. Attack/4 Sp. Defense
-Fire Blast
-Energy Ball
-Nasty Plot
-Hypnosis

Any suggestions for making it better? Feel free to comment.

EDIT: I actually got many of these strategies from Serebii's website.