Mr Terrible, Carroteye, and Sloppus Pet Battle

Pets to Use:
Eternal Water Strider (1,1,2)
Wild Crimson Hatchling (1,2,2)
Any other pet

vs Mr. Terrible
Open with Eternal Water Strider
Pump > Pump
Mr. Terrible should die at this point, but if not then Healing Wave > Water Jet

vs. Carroteye
Pump > Pump > Healing Wave > Water Jet
That should bring Carroteye down.

vs Sloppus
Scorched Earth > Breath until he dies
If your luck is really bad here, you will miss alot due to the hit chance debuff called Stench that Sloppus casts, and he will most likely end up killing you before you can kill him. If that's the case, don't fret too much. Just bring your Eternal Strider or backup pet out and finish him off. Also be aware the debuff persists through swaps!

The reason I don't like using whirlpool pets on this fight (such as with a Pandaren Water Spirit) is because Carroteye can cleanse it and it ruins the whole damage burst setup.

Note: You can also use a Nexus Whelping (1,2,1) if you don't have a Wild Crimson Hatchling. The Nexus Whelping is easier to get since it doesn't require any faction reptuation. If this is the case, when you fight Sloppus you would just:
Wild Magic > Tail Sweep until he dies

OR try this Alternate Strategy

Pets to Use:
Ruby Droplet (1,1,2)
Wild Crimson Hatchling (1,2,2)
Any other pet

vs Mr Terrible
Acid Touch > Dive
If this Dive doesn't kill him, forfeit and start over. It normally does, but you how RNG can be.

vs Carroteye
Acid Touch > Drain Blood > Acid Touch (x2) > Dive

vs Sloppus
Swap to Wild Crimson Hatchling
Scorched Earth > Breath until he dies