Tiny Madness

Fossilized Hatchling 2/2/2
Unborn Val'kyr 2/2/1
Zandalari Kneebiter 2/2/2

1. Start with Fossilized Hatchling and use Death and Decay.
2. Switch out to Unborn Val'kyr
3. Curse of Doom.
4. Haunt, switch to Zandalari Kneebiter.
5. Black Claw.
6. Hunting Party.

You can use a different pet with Death and Decay for the first step. It's only there so you don't need to deal with the shield.

i simply set up a team of lvl 1 undead pets (just a suggestion to keep it easy for people who are new to pet battles) - no special strategy, abilities or anything else needed.
winning regular lvl 25 fight against this guy can be a real challenge depending on how many pets you already have collected and which of them might be the right ones for this fight - but when you use a lvl 1 undead team, he usually dies pretty fast - plus the fact that they auto-revive once per fight makes it even easier 👻
just make sure that your pet's first attack does a reasonable amount of undead damage.
the winning pets will get a good amount of xp after the fight and eventually level up (speaking of a lvl 1 team).
so it might be a good idea to find a nice team of easy-to-get pets, gather some clones of pet number 3 and simply replace it with a fresh lvl 1, to make sure your enemy doesn't unlock it's next ability --> ❗this is the case as soon as one of your team is level 2 or higher❗ this way you're able to maintain 'easy-mode'.
pet number 3 is usually the only survivor... but if you're lucky and the enemy is almost down while your pets nr. 1 or 2 are still alive, punch him until only one or two attacks are needed to kill him. then start using the 'pass' button to let him kill all pets that were involved in the fight and therefore qualify for XP. finish him with pet nr. 3. always put the cheapest / weakest pet in slot nr. 3, this way you only have to find a replacement for one easy-to-get-pet 😛
💡- works for any level-scaling pet battle, just chose the right type of pet / dmg / resistance for each fight -💡

Unborn Val'kyr - Unholy Ascension is a must for this one, spend too much time with changing skills.

So 1. Pet Unborn Val'kyr - Curse of Doom + Shadow Shock + Unholy Ascension ( Dies )

2. Pet Restored Revenant - Roar of The Dead - Ghostly Bite ( Stun Change to Pet 3 )

3. Pet Tiny Apparition - Absorb - Siphon Life - Bone prison ( Bone Prison and Absord was enough for me )

Btw inspired from Sipder2, have a nice day all.