Orotron 4999b is battled alongside Protectron 022481 and Protectron 011803 as a Legendary pet battle Daily within your garrison.
I bypassed their Robofauna buff by using Ondata di Magma (the backrank pets stay mechanical!).
Move order: Trappola di Magma forces Orotron 4999b out of the battle, and leaves you with one of the Protectors. This is useful, as Bling's humanoid ability will otherwise deal full damage to your Raggy, while the Protector has all Mechanical abilities.
When Piccolo Ragnaros dies, swap in Spirito del Fuoco dei Pandaren (or any other elemental pet with Ondata di Magma). Simply cast Ondata di Magma until he dies. The backrank minions will likely die, but do not need to (simply popping their mechanical passive will be enough).
Finally, swap in Cucciolo di Zaffiro (or any other high-speed beast sweeper) to finish off the job with strong beast attacks. Cucciolo di Zaffiro's strength is that its Elemental type means it will survive even a crit from Raggio di Ioni, not to mention that it's the fastest pet in the game and outspeeds all 3 of the enemy pets.
An alternative sweeper would be the Araldo delle Fiamme. He can magma wave any last-minute backrank survivors and then use Impalamento to make quick work of the main target.
Start out with Assorbimento and use Bolla and Risucchio del Sangue when needed.
Orotron 4999b, Protectron 022481, and Protectron 011803 are a part of the Legendary pet battle Dailies within your garrison. They do have an ability called Robofauna making the front pet take damage as a critter; however, while still in the back row they will continue to take damage as mechanical.
The health of Ragnaros will be low at this point. Cast Flamethrower (and if need be, once more) to cause Protectron to cast Raggio di Ioni killing Ragnaros and starting a 2 round recharge. Switch to your leveling pet and then immediately switch to your Crawdad. Cast Wish and finish off the fight spamming Surge.
If you upvote dont forget to do so on my comments for the Protectron 011803 and Protectron 022481!
Fastest team I've found for these guys which DOESN'T require a hard-to-find pet is a team of easy-to-catch Zibetto Dorato and Cucciolo di Zibetto Dorato. Easy peasy. One of them can ALMOST solo the protrectrons, but I usually end up needing both.
Any pet for slot 3, I didn't even need to pull this one out, I threw Corgi Ardente in there but again I never had to use it.
took a couple of tries but I finally got it with a team consisting of Araldo delle Fiamme, Idolo Anubisath, and Cucciolo di Segugio del Nucleo.
Most of the time your S/S Piccolo Lupo Cattivo will solo all 3 pets, but with bad RNG (low Claw hits bringing them below 30% health without killing them), thats what the second P/S Piccolo Lupo Cattivo is for.
Cucciolo di Grinfiafurente destroys all 3.
Questo PNG si può incontrare qui: Rocciafredda (5) e Calaluna (4).