IMO special Luxray isn't worth of training. It has huge Attack and only decent SpAtk, but if I wanted to run a special Luxray, I'd try:
- Thunderbolt
- HP Ice
- Signal Beam
- Thunder Wave / Superpower
EVs: 6HP / 252spAtk / 252speed @: Air Balloon (if V gen), Life Orb (both), I'd run a Choice Scarf if Superpower is chosen. But IMHO making this guy special is like making Blissey a physical sweeper or Rhypherior a special Sweeper
+ it's special movepool is very shallow. It has many great options as a Physical Sweeper and In V Gen it can learn Wild Charge which combined with it's large attack is pretty devastating! and it's a slow pokemon, it should have +speed nature, have Choice Scarf or receive a Baton Pass to proceed Sweeping.