Drop: Spirit of Jadefire 
Zone: Timeless Isle
Approximate Drop Rate: 1 in 50
100% Hit Chance
Breathes jade fire on to the enemy, dealing 394 Dragonkin damage.
Rakes the enemy with jade claws, dealing 413 Magic damage.
Reduces up to 98.5 damage from each attack against you.
Lasts 5 rounds.
Deals 236 Elemental damage instantly. The enemy Burns for 98 additional Elemental damage per round for 4 rounds.
Restores 394 health plus half of the last hit taken by the user.
The user fades away, avoiding the opponent's attack. The user then swaps with a random pet.
Elementals ignore all negative weather effects. Enemy pets can still gain the beneficial effects from weather when facing an elemental.
50% from Aquatic abilities
33% from Mechanical abilities
Zone: Timeless Isle
Mob: Spirit of Jadefire (SoJ)
Shamelessly Taken from; WowHead.
Spirit of Jadefire Spawn locations:
1) 48.0, 61.1
2) 54.6, 71.8
3) 65.2, 65.1
4) 70.7, 62.7
5) 63.0, 35.1
6) 74.6, 33.9
7) 54.4, 30.6
CrossRealm: Tag the SoJ and then Leave Raid Group. You will not have access to the Loot from the SoJ unless you do.
As other people have commented, you should camp on the ramp, closest to the Majority of the Spawn Points.
According to Rarity, this drop took 102 kills on just one alt. I was worried my loot table was bugged somehow, but droprates aren't cumulative. RNGesus finally came through for me, though! Keep at it, and eventually you'll prevail. The respawn rates others have posted are pretty accurate, but I had issues using Cross Realm Assist to speed the process up - on other realms, I was unable to loot the SoJ at all.
This pet's unique ability is to Immolate and then be able to Fade to another pet with Conflagrate--Say having Lil Ragnaros or a Parched Lizard standing by to do a huge amount of damage. The Parched Lizard has 2 abilities that are good vs Undead.
After killing her somewhere in the late 50s (I lost count around 37), I finally got it at 11:00 pm! Hazzah. I can kiss that cave goodbye! If anyone doesn't know already: She spawns every 30-60 minutes. I've had her show up literally in 30 minutes or in an hour and anywhere in between. It's easiest for me to make sure no one else is in the cave and then just hang around the entrance. If someone does enter and stays: ask to wait for u if ur own side and follow if not ur side-she dies VERY quickly.
I've lost the count how many times I've killed this chick...she and the crab are the only ones I'm missing from the isle (and porcupette ofc, l hate pvp). Got the Glowing Green Ash twice in a row, TWICE! and no freaking pet :( bad thing is yhat I can't even find her in AH otherwise I'll buy it in no time.
Im missing 3 pets from the Timeless Isle. Was pretty lucky with all the others, but of course the RNG curse of the doom is back on me. Farming this one for days, cant tell how many times Ive killed this thing (and I would add: being killed so many times for that stupid pvp coins) but nothing. And the best part is when you kill it and the guy next to you just drops it like this. =(
Well, keep trying and trying...
Finally got it today after 175 kills! Hopefully blizzard will make it up to me for the awful RNG on the next pet I go for.
For anyone who doesn't know: Jadefire is on the good ol' timeless isle 30-60 min spawn timer. When you kill him, it's best to mark down the time somewhere, run off and do other fun things, and come back when the 30 minute mark hits.
Killed her over 20 times on Wednesday and nothing! Following day killed her once and it dropped! She's gorgeous too!
The drop rate on these new pets is ridiculous, I've killed this thing over 40 times and still no pet.
I've gotta be around 30+ kills on this thing in the past week...and still no pet. Worst drop rate out of anything on the Isle, and to add insult, it's on a very inconsistent ~50 min. spawn timer. To make matters worse, it's a barely above average battle pet...oh and thank god Fade got a CD.
I've been camping this rare for days now. There are more spawn points than mentioned. He will appear at a couple of locations in the front room; at either end of the "ramps", the alcove mentioned and also at the top of the spiral ramp deep inside the cave. You can stand on the first set of ramps with mini-map at max range and see the rare icon spawn in all of those locations.
Like many of the other pet rares, the Jadefire Spirit that this drops from respawns on a 30-60 minute timer. Never less than 30 minutes, never more than 60 minutes. Camp the cave until it spawns, kill it, then go do something else for half an hour. Horrible drop rate, so expect to do this for a few days.
You can kill all the non-rare elementals in the cave while you wait if you feel like it, as they also drop a pet. It can be a good way to kill time while camping.
People who are using this pet to try to get people to forfeit clearly have nothing else better to do. They'd rather sit and wait 30 minutes for someone to forfeit before accepting their LOSS. I'm a natural, stubborn taurus and don't let these crappy pet trainers win. /flex [; I'm 100% sure that Blizzard will have this pet nerfed soon!
The 'fade' ability on this pet with no CD has got to be nerfed. Was PvP pet battling this morning, took out my opponents first two pets, then sat there for almost 40 minutes - literally 273 rounds, while the guy used 'fade' (which always goes first regardless of pet speed) over and over making his pet unhittable. After the first 10 minutes of this I was going to be damned if I surrendered . . . and 30 minutes later he finally gave up. Really bad planning on Bliz's part with this one :P
After about two days of farming around every hour, this little baby finally dropped for me while farmig Jademist Darters with my boyfriend. Very pleased my friend told me she was up so I could grab this little bugger. =3 I'd say the spawn timer is about 30-45mins.
Very lucky and got this first time I saw this rare, I love it so much! He was in the front room :)
I was lucky enough to get this pet on my first kill. He was in the first area at the entrance to the cave. Good luck everyone!
The rare actually spawns in at least three different places in the cave--in the front room, in the back by the big fire, and then in one of the side rooms in the back right (looking at the map). If you don't see him in the first room, he might be farther in :)
Got mine after 4 times seeing it spawn, first time it died before I could hit it
number 4 dropped the pet.
I find it a slow respawn timer :)
Drops from Jadefire spirit, a Rare who spawns inside the first room in the cave. Only seen the rare once since launch so idk if he comes out less often then most