85 pets
Lil' XT
(74.8%)
Binds when picked up
Use: Teaches you how to summon this companion.
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Want it | 
Neutral
Occasionally pounds the ground, throws a tantrum, and falls asleep. For other interactions, see below.
Vocalizations (periodic)
Destroys nearby Clockwork Rocket Bots, Darkmoon Zeppelin, and Toy Train Sets.
This pet is available for digital download exclusively from the Blizzard Store. It may be purchased using any major credit card. Players who purchase this pet will receive a code which may be redeemed on a single WoW account. Thus, players who have more than one WoW account bound to their Battle.net accounts must choose which account will receive this pet. Codes may also be purchased as gifts for other players. The pet is retrieved via an in-game mail from Jepetto Joybuzz.
Lil' XT will shoot and destroy any nearby rocket bots (without retaliation). It will also destroy the Darkmoon Zeppelin, any nearby Toy Train Sets and other toys.
Vs. 
Beast
Vs. 
Elemental
Critter
Flying
My Clockwork Rocket Bot? Clocked. My Crashin' Thrashin' Racer? Crushed. My Toy Train Set? Derailed. My Wind-Up Train Wrecker? Wrecked. My Grindgear Toy Gorilla? Ground into dust. You're right, Lil' XT... it *DOESN'T* bend that way. And yes, Lil' XT, you most definitely broke it. So for the last time, *NO*, Lil' XT, you cannot "see" my epics!!!
Although boombot is an amazing damage, I've recently realised that Tympanic Tantrum is even better. I just let it autodamage all 3 pets while doing other stuff, then repair, put out the baby pet I need to level and back to this guy -so Tantrum is off CD by this point, rinse and repeat. Great if you have to do other stuff but you cannot stop yourself from logging into WoW :)
Had this little guy for quite awile, and I was totally excited when they started doing Battle Pets. Sure enough, this guy is a freakin tank. Talk about big brawler.
I also got this guy by being a paid subscriber to WoW Mobile before it went free. As a battle pet, he's great vs. anything but elementals, and amazing against beasts. Use Boombot then Repair when he's at about half health and 3 turns later, you're back to full and your enemy goes Boom. When he says "Ready to play!" it never fails to make me smile :)
Keep your fingers crossed that he stays available.
8/04/2010 He's gone again!
Whenever clicked on he will preform a higher pitched humming noise, the same sound that Big XT does when he's attacking.
Also, he now rarely will "wind" himself up with a cute little whirring and clicking sound.
update: july 30..just tried to purchase lil xt from the blizz store...still receiving error message that was there when they had no more codes...tried to call blizz..."hold cue" is full...sigh...one of these days i will get my hands on lil xt!!
"Lil' XT has been temporarily removed from the store, everyone. We plan on bringing Lil' XT back as soon as possible, though. While I don't have an ETA to provide, I encourage you to check back over the course of the next couple weeks. :)"
Source: http://forums.worldofwarcraft.com/thread.html?topicId=26227282739
I assume this has something to do with fixing his voice...
Excelent to super-size him, then baby-spice (shrink) yourself at the same time. Especially if you are a gnome.
"Blizzard, please make some way to get the bisquits in-game! The biscuits will eventually run out on ebay!"
I really hope Blizzard makes more boss pets. I think it's a great idea. There are a few bosses out there I wouldn't mind having as a pet!