Qiraji Guardling
Source: Pet Battle. The squeaks used by these tiny insectoids may sound cute, but they're actually screaming for your death. Humanoid type. The unfortunate thing about this being a summer-only pet is that the expansion - and pet battles with it - is released one week after the end of summer.
The Qiraji Guardling is a seasonal wild battle pet found near the Scarab Wall outside Ahn'Qiraj in Silithus, available only during the northern hemisphere's summer months.
Guide awaiting review
Travel to Silithus
Head to Silithus and make your way to the Scarab Wall outside Ahn'Qiraj. The Qiraji Guardling spawns in the area surrounding the wall, with known spawn locations starting at 29.8, 79.6 and spreading across the zone up to 41.39, 79.55 and beyond.
Check the Season First
The Qiraji Guardling only spawns during summer in the northern hemisphere, roughly late June through late September. If you arrive outside that window, no pets will be present — confirmed by Blizzard developer Cory Stockton via Twitter.
Hunt Spawn Points Methodically
Patrol the confirmed spawn locations around the Scarab Wall, including 32.17, 78.57, 33.4, 75.4, 34.0, 78.6, 35.6, 80.0, 37.0, 80.2, 38.0, 84.0, 36.88, 76.72, and 55.00, 8.60 in Ahn'Qiraj: The Fallen Kingdom, checking each point for active battle pet spawns.
Capture Responsibly
Once you find a Qiraji Guardling, capture one pet rather than repeatedly defeating spawns to farm for a rare quality — other players have also been waiting months for this seasonal pet. If you need a higher quality version, use a 
Flawless Battle-Stone to upgrade it instead.
Tips
The Snowy Owl is considered the direct seasonal counterpart to the Qiraji Guardling, spawning during winter months (November to February), so if you missed one window you can work on the other while waiting.
See the video guide for a visual walkthrough of the spawn area around the Scarab Wall.
