WoWDB

You will need to have completed the quest Last Year's Model in order to purchase the challenge card that allows you to fight Blingtron 3000.

The mechanic is simple in theory but difficult in practice.  Blingtron 3000 (I'm going to shorthand it to B3K) is in one corner and a charge conductor device in the corner opposite of the boss.  In order to reduce B3K's health to something manageable, you will need to kill six of the little blingtrons that also spawn in the encounter.  Kill them such that they form a chain from the conductor to B3K, then activate the conductor.

At the same time, B3K will occasionally launch a rocket at your current position.  Be sure to run out of the large targeted area.

Now, if your item level is high enough - and your class/spec is 'right' - it is entirely possible to ignore the main mechanic and simply focus on B3K.  I was able to do this as an ilvl 555 fire mage with full gems and enchants, +300 int from being well fed, +1000 int from being flasked, and +4000 in from quaffing a potion just as the fight began.  For talents, I used:  Presence of Mind, Ice Barrier, Cauterize, Living Bomb, and Invocation.  (Tier 3 talent doesn't matter in this case.)  Arguably, I should have switched to Ice Floes from PoM, but I have trouble making proper use of the talent so I kept the easier one.

Mirror Images, Time Warp, and Alter Time are your friends!  If you are a troll like me, don't forget Berserking either.  Blink is also pretty good for minimizing downtime.  (I tend to derp and just run out of the rocket area while spamming Scorch.)  Get all your buffs rolling, then use Alter Time to snapshot - and thus, lengthen - the duration of Time Warp and the potion.  PoM will be copied, too, so you get another free cast of Pyroblast.

Combustion is kinda tricky.  Do your best to get a high DoT tick from Ignite going on B3K, but don't hold back on using Combustion for too long.

Ignore the small adds.  Recast Ice Barrier as needed.