Microbot XD
Source: Profession. One of the microbots used to guard the city of Rustbolt, now purchasable for a reasonable price. Mechanical type.
Microbot XD is a Battle for Azeroth pet obtained via a profession blueprint that drops from the Rustbolt Resistance Paragon cache, earned by continuing to gain reputation with the Rustbolt Resistance after reaching Exalted.
Guide awaiting review
Reach Rustbolt Resistance Exalted
Earn Exalted status with the Rustbolt Resistance in Mechagon, then keep gaining reputation to receive Paragon caches.
Open Paragon Caches
Each Paragon cache has a chance to contain the 
Blueprint: Microbot XD — the drop is not guaranteed, and players have reported needing to open over a dozen caches before receiving it.
Craft the Microbot XD
Once you have the blueprint, learn it and craft the Microbot XD through the Engineering profession to add the pet to your collection.
Tips
The blueprint is tied to a meta-achievement involving multiple Engineering blueprints from Mechagon, so collecting it also contributes to that achievement.
