Timeless Mechanical Dragonling
Sold by Historian Ma'di. Dragons come in all types of temporal classification -- timeless, time-lost, and even infinite. Mechanical type. One of only 2 battle pets (the other being Mechanical Pandaren Dragonling) that's Mechanical with a Dragonkin-type attack, making it fairly good vs.
The Timeless Mechanical Dragonling is a Mechanical-type battle pet sold by Historian Ma'di during a World Event, and it is the only anniversary pet purchasable with Timewarped Badges that can be caged and traded.
Guide awaiting review
Find Historian Ma'di
Locate Historian Ma'di at 62.6, 50.4 in Tanaris to purchase the Timeless Mechanical Dragonling.
Purchase with Timewarped Badges
Purchase the Timeless Mechanical Dragonling from the vendor using 
Timewarped Badges.
Tips
The Timeless Mechanical Dragonling is one of only two battle pets combining Mechanical type with Dragonkin-type attacks, making it effective against Magic-type opponents.
Unlike other anniversary pets, this pet is cageable, allowing you to buy extra copies from the Auction House at potentially lower prices during off-seasons or resell them for profit.
