Great, but you can always add in Light Screen, since he already has good defense. Heres what you might try for a couple Magnazone Strategys.
I like to call this one: toxic.
Start With Light Screen for raising special defense so he has incredible defense and sp. defense. Next, use Toxic. Then use Screech/Metal Sound(depending if your magnazone is physical or special, if phys, use screech, if spec., use metal sound for making easy sweeping) and finally, after toxic has weakened alt, finish with Thunderbolt or Flash Cannon, or Spark(whichever one you like!).
I call this one: Sweep
Start with Metal Sound. Then, add in Thunderbolt. Next, is Flash Cannon. Finally, put in magnet rise, for some defense.
Then Theres the one I call: Defense.
Start With Barrier. Now Magnazone has unlimtited defense. Next, add Toxic, and then Light Screen. Magnazone now has unlimited defenses and the opponet is Badly poisoned. Here, the last move is optional, Thunderbolt and Flash Cannon are popular here, but thunder Wave and Double Team are good too for more defense.