The Celestial Tournament

For those unsure of the actual rules of the tournament, if previous posts aren't so clear, they are something like this:

-It's a solo scenario, so you won't be competing with other players laughing at you.
-You can't revive battle pets, clicking on "Revive Battle Pets" or a "Battle Pet Bandage" will give you a "you can't do that now" message. You don't need to worry about reflexively clicking the heal button and getting thrown out.
-Your pets CAN use healing abilities in battle, only reviving is prohibited.
-You will know who you're facing. Rather than being shoved into a room with random encounters coming at you and needing to improvise, you can see who you are fighting before you start and plan your team accordingly. You can also choose the order in which you fight them.
-You can use and switch out as many pets as you have. You are not going into a straight gauntlet of pet battles with no room to breathe.
-You will not be penalized for fleeing. If you need to start over or have a pet in the wrong slot, you are free to flee and rearrange as needed.*
-There is no time limit. Take as much time as you need to rearrange your pets, read up on fights, and get a drink. Keep in mind that, since this is a scenario, you will need to start over if you leave.
-The three trainers you fight are reset once a week. The trainers you face on Tuesday will be the ones you face for the rest of the week. You don't have to worry about your opponents randomly changing when you leave the tournament.

-The three trainers seem to rotate in teams of three.
Team 1 is [npc=71926] Dr. Ion Goldbloom and Sully "The Pickle" McLeary
Team 2 is Taran Zhu [npc=73030] and Wrathion
Team 3 is Wise Mari [npc=71933] and [npc=71930]
It will take a few weeks to know for sure, but it's the fourth week and I'm seeing the same team as I did on the first week.

*If a Mechanical pet dies and is revived by the failsafe, the pet will be alive if you flee.

A number of players seem to be having a hard time with Chi-Chi.
With the proper pet setup, Chi-Chi is the easiest of the four celestials.

SNAILS!

• 
  
• Chi-Chi only has an elemental attack, which is weak against critters. Snails are critters.
• 
  
• Chi-Chi is a flying pet and takes extra magic damage. Snails have a magic attack.
• 
  

Whether you have a [npc=64352], [npc=62313], [npc=62246], [npc=63001] or [npc=51635] does not matter, they all have the same abilities.

Maintain the [petability=369] debuff at all times and spam [petability=445].
Use [petability=564] during the third round when Chi-Chi goes [petability=998]. Since Chi-Chi uses that ability on cooldown thereafter, you will not be able to use Dive each time, but each time you use it during her Ethereal, you save yourself about 500 health from the subsequent quills. Definitely do that, and thank Anistasia for the tip, as it allows you to end the fight with your second snail at more than half health!

I killed Chi-Chi with two snails, and had an [npc=68819] as a backup in case Chi-Chi needed to be finished, but he did not see combat.

Note that I tried using [petability=310] instead of [petability=369], and got my behind handed to me. It is really important to maintain that debuff.

EDIT: if your two snails can't finish off Chi-Chi (it can happen with some bad rng), use an arcane eye to do the job:
use [petability=475] on the first round, one time is enough to give you the initiative. Use [petability=474] for a free round and either [petability=473] or [petability=483] thereafter. You should not need to use that third ability more than once or twice. [npc=68662] would also be a great "finisher" with [petability=362] and [petability=593]. just don't throw your surge if Chi-Chi's [petability=998] is off cooldown.

EDIT2: a note for alpanhell and others still having issues with this strategy, make sure you do the following:
Round--- Ch-Chi----------My Pet

1. 
   
2. Tranquility---------Pass
3. 
   
4. Fire Quills---------Acidic Goo
5. 
   
6. Ethereal------------Dive, part 1
7. 
   
8. Fire Quills---------Dive, part 2 (quills miss)
9. 
   
10. Fire Quills---------Ooze touch
11. 
    
12. Fire Quills---------Acidic Goo
13. 
    
14. Ethereal-----------Swap to Snail #2
15. 
    
16. Fire Quills---------Ooze touch
17. 
    
18. Fire Quills---------Ooze touch
19. 
    
20. Fire Quills---------Ooze touch - Dead Chi-Chi
21. 
    

The fight might last longer if you miss a dive or Chi-Chi decides to pop tranquility in round 10, but you have Dive available at round 11 for his next ethereal and your trusty Darkmoon/Arcane eye if things go south. I haven't seen Chi-Chi pop tranquility a second time in the past few months.

If Chi-Chi somehow destroys your team, switch to the Pandaren Water Spirit/Chrominius nuke strategy. I never had to do that but it's good to have a backup strat.
Please post if you are still having trouble with him and this strategy.

After 20+ hours of desperate attempts and 100+ dead pets I was finally able to complete the Celestial Tournament. This quest is insanely hard but the rewards from it are well worth the effort.

Here is how to beat the 4 Celestial Pets along with Lil' Oondasta. The Celestial Tournament consists of total 7 fights ( 3 legendary pet teams and 4 legendary elite boss solo pets ). The pet tamers are fairly easy so I'm only going to explain the celestial pet fights. The tournament is a solo scenario weekly quest. However, you can fight Lil' Oondasta every day just outside the arena.

Yu'la, Broodling of Yu'lon

Team:
●[npc=73532]
●[npc=73532]
●[npc=73668]

Explanation:
You need fast pets with strong humanoid attacks. Pets with interrupts ( Kick ) such as Dandelion do very well but mine weren't able to beat her. Her first ability is her shield so make sure you damage her before she puts it up. After that spam your interrupt and dodge abilities as much as possible. She no longer has Life Exchange - She now uses Lift-Off which makes her fairly easy although it does a lot of damage.

Chi-Chi, Hatchling of Chi-Ji

Team:
●[npc=34724]
●[npc=69848]
●[npc=69848]

Explanation:
Chi-Chi now starts with Tranquility, followed up by Quills and only after that does she use her Ethereal. I started off by using Feedback followed up by Deflect and afterwards I use my Amplify Magic. After your Wyrmling dies, switch to one of the Porcupettes and time your Spectral Spikes which wins you the fight. Afterwards you just need to spam Powerball while Spectral Spine and Spikes ore on cooldown.

Xu-Fu, Cub of Xuen

Team:
●[npc=55367]
●[npc=55367]
●[npc=55356]

Explanation:
I used the Darkmoon Zeppelins for 2 specific reasons. Their Explode ability which deals a very nice amount of damage and more importantly their block ability. All you need to do is use Block when Xu-Fu drops to ~70% hp to block his Feed. The rest is just dealing as much damage as possible.

Zao, Calfling of Nuizao

Team:
●[npc=69778]
●[npc=70451]
●[npc=70451]

Explanation:
Nothing special about this fight. Open with Fel Immolate followed up by Call Lightning. Spam Fel Immolate until your Micro-Sentry dies ( Not more than 1 turn after using Call Lightning ). After that victory becomes simple. Switch to one of the Zandalari Anklerenders, use Black Claw and proceed with Hunting Party which is supposed to end the battle. You won't even need to use your third pet.

Lil' Oondasta

Team:
●[npc=69778]
●[npc=70451]
●[npc=70451]

Explanation:
This fight is a little bit different than Zao. You open with Call Lightning. Right after that your pet get's switched to one of the Zandalari Anklerenders for free because of Oondasta's ability. Proceed with Black Claw and then Hunting Party. If Oondasta is still alive after that and your raptor dies, just use your second one.

UPDATE: Added Lil' Oondasta fight to the guide and updated the other 4 fights' explanations and team compositions.

Edit: Woot! I have the green text xD

I hope this was helpful and wish everyone good luck!