Pet Battle: [23-24] Uldum
Pit-pattering footsteps; vocalizations (on-click)
Snaps at the enemy, dealing 394 Beast damage.
Wildly flails at the enemy 1-3 times, dealing 197 Beast damage per hit.
The user lowers its body close to the ground, reducing all damage taken by 50% for 2 rounds.
Frightens the target, dealing 197 Beast damage and reducing their speed by 25% for 4 rounds.
Poisons the target for 118 Beast damage every round for 6 rounds.
Goes on rampage, dealing 492 Beast damage.
Rampage continues for 3 rounds.
After 2+ hours farming for a rare I finally got one as secondary to a gray leopard scorpid with a green sidewinder in the last slot. Checked everywhere that was mentioned in comments below. Finally found it just west of Gate of Unending Cycles. 60.67, 20.51 During this time I had every possible Uldum pet come as a rare, most of them numerous times. Even a twofer with a sidewinder in front and a mac frog last. Honestly was beginning to think rare leopard scorpids were a myth.
Got mine (a rare, first try!) down behind the Lost City of Tol'vir attached to a Locust.
got my rare as a piggy back to a tol vir beetle. it was at the ruins of ahmtul 45.17, by one of the quest bosses. far enough away it didnt argo him. got the blue/ white shiny one :) im happy :) in uldum :)
Found my rare of a Locust, so they do come from those aswell.
These seem to be changing colour every time you summon them. So far mine has appeared with all the colours except the white one with blue spots.
I don't know if this is just the rare quality ones that does it, might be, since my poor quality one never seems to change colour.
Here is where I found these while rare farming for this pet:
Found 4 spawns of this mob at 32, 57 (noth of ruins of Ammon) as the leader of the pack.
They are also the second pet from pet names Sidewinder, Tol'Vir Scarab, Desert Spider, Horned Lizard, Oasis Moth and Emerald Boa
If you are lookingfor the Leopard Scorpid, I did NOT find any from any Dung Beetle, Mac Frog and Locust pets that were by that name as first pet.
PS came across 2 sets of Dung Beetle with TWO RARE Dung Beetles with each battle around 33, 40 in case you were looking for some.
Finally found a rare with a sidewinder first pet and Leopard Scorpid as a add at 38, 8 top of zone to the west close to Obelisk of the Moon.
Found several of these as primaries in Uldum at Orsis. Around 40.8, 42.0