Aki the Chosen

1: Carry pet
2: Anubisath Idol (1,1,1)
3: Emerald Proto-Whelp (2,1,1)

vs Chirrup
- Attack with your Carry pet > switch to Anubisath Idol
- Sandstorm > Crush until Chirrup dies

vs Stormlash
- Sandstorm > Crush until Stormlash dies
- If Stormlash cast Thunderstorm again, then immediately recast Sandstorm

vs Whiskers
- From here on, cast Deflection when Whiskers has dived, Sandstorm when off cooldown, Crush as a filler
- Switch to Emerald Proto-Whelp when your Anubisath Idol dies
- Chain cast Emerald Bite, unless Whiskers has Dive off cooldown (then cast Proto-Strike)

Many people may want to know how to 2-pet this boss in order to help level a third pet. I found a surprisingly effective method for doing this.

Pet 1) Anubisath Idol . This pet is the real trick to this fight, and I haven't found any pet with a comparable set of abilities uniquely suited for this boss. You want to pull until the trainer begins with their dragon pet; this may not matter too much, but the double-damage buff that the critter does is fairly dangerous when facing the dragon. Open the fight using Reflection, it'll reflect the hard-hitting weather ability of the dragon. At this point, use Crush repeatedly to kill the dragon.

When the critter comes out, use Sandstorm; now this is where it gets kind of funny. The critters only attack is Swarm, but it's weak against humanoids, and Sandstorm reduces damage, so it turns out Swarm ends up hitting for so little that the Idol doesn't even take damage. Easy win. At some point, you'll need to pull out your low level pet. With Sandstorm active, it's fairly safe to pull out a pet against the critter, but if you're really desperate, wait until a Swarm ends (it lasts 3 rounds), and then bring it out at that point.

Pet 2) Any flyer. You just need to kill the water pet now, it's easy. The Idol can probably do it fine as well, but the Flyer will be a lot faster and there's no reason not to use that third pet slot.

EDIT: My personal favorite for doing this easily, albeit not a requirement, is Gilnean Raven (Gilnean Raven). Open with Darkness, partially to get rid of the Lightning Storm (since you hit harder than your opponent, a flat +damage hurts you more than them). Peck once, and once they get in range of being killed with the strike, use it (it should do over 800 damage and will never miss unless the opponent dodges, since Darkness is up).

If you don't have that, use a Flyer with lift-off in order to avoid his second Dive. The problem you'll run into with this pet is that when he gets under about 30% health, he uses Survival. If you don't have anything that can knock him from like 40% to dead in a single hit, and if your slower than him (particularly if your Flying speed buff falls off due to taking damage), then he WILL end up activating this, and if he does, he'll probably get a chance to Dive before you can kill him.

Just want to let everyone know that after 5.1, yes, there is a 3,000g reward for this achievement ("I Choose you").

HOWEVER! For those of you that have ALREADY ACHIEVED THIS PRIOR TO THE PATCH, you will receive this money ONCE through the mail on only one character and because this is an account based achievement, only ONE CHARACTER WILL RECEIVE IT. That means that if you decide to log on to a character on a different faction or realm, then characters on other realms and faction will not receive the reward.

Unfortunately I decided to log on to an alt on a different realm (completely forgetting about the reward as well >.< ), was given it in my mail, logged back on my main on a different realm and couldn't receive the money there.
I used the money to buy more battle pets on the AH in the end.

So just a warning, hopefully before anyone else makes this mistake.