WoWDB

I use this pet to power level all my pets to 15-18 ish. All you do is go to Hellfire Peninsula and set your skills to Zap, Repair and Tympanic Tantrum. Fight anything in the Peninsula with your low level pet as first slot, attack once and then swap to Landro's Lil XT. Cast Tympanic Tantrum which will be strong against all targets as every pet battle in Hellfire Peninsula is a beast. By the time thats done just Zap twice and the fights over. I have 30ish level 25 pets and this is the best way to kick their leveling off before you take them to trainer dailies to power level up to 25.

This pet is from the  "Worldbreaker." TCG set.  This pet has the same model but different color than the Lil'XT from the blizzard store.  It does however maintain the same playfulness as stated by the cards flavor text "Always 'ready to play,' Landro's Lil' XT is almost indistinguishable from the original. Prone to tantrums and narcolepsy." as well as the destructive fun of destroying any other mechanical companion put out around him such as the toy train set or the mechanical gorilla.  This can be caged and sold in the AH.  To redeem the card you must first visit the wow promotion page and after you get your in game code go to Landro Longshot in booty bay.