Bert's Bots

I'm sure it's not well know yet, but this particular trainers pets scale with your own in level. Using all low level pets (preferably level 1) will lock all his pets to level 1. Meaning his first pet will blow himself up right away, the second pet only has access to the stackable DoT and the third will only be able to attack once every 3 turns due to his cooldown. Since their attacks are weak to elementals using 3 level 1 elementals regardless of what they are will pretty much win every time.

A new account-daily pet battle in the outer area of Gnomeregan (just go down the lift and around to the left) with a chance to drop [item=151645]

His mechanical pets do nasty damage and have some annoying swap and burn mechanics. After several attempts to mitigate and avoid the mechanics, I finally just burnt them down with 3 fast (244+) elementals. They need to be fast to get a hit in on Corporal Hammer before he swaps your pet out.

I used Dark Phoenix Hatchling, Fel Flame and Phoenix Hatchling, all with Burn, Immolate and Conflagrate. My kill sequence was:

D: Immolate
F: Conflagrate
D: Conflagrate - Corporal Hammer revived
F: Immolate - Corporal Hammer dead
F: Immolate
F: Burn
F: Conflagrate - M-37 revived and then dead
F: Immolate
F: dead and swapped in Phoenix Hatchling
P: Conflagrate
P: Burn - Clamp revived
P: Burn - Clamp dead

Note not foolproof, I failed the first attempt but the second went OK with a margin of safety. Good luck!

Blossoming Ancient / Broot with the following moves:

Ironbark
Photosynthesis
Sunlight

Sunlight (Swap)
Sunlight (Swap)
Photosynthesis (Swap)
Photosynthesis (Swap)
Ironbark from here, using Sunlight on CD and Photosynthesis with one stack left.

This does not ever fail. Very easy!