Aquatic Battler of Undermine

/way #2346 55.0 69.6 Precision Powerdrill
/way #2346 39.0 15.8 Baxx the Purveyor
/way #2346 59.6 27.0 Prezly Wavecutter
/way #2346 32.2 82.0 Creech

I finally beat Prezly Wavecutter with an aquatic team. Here's how I did it.
My victorious team:
Jungle Darter (1 1 1)
Magical Crawdad (2 2 2)
Pengu (1 2 1)

Her first flying damn parrot, Lookout (a proper name), is alone the doom of the entire team if not carefully considered.
So I started with the Jungle Darter just to spam Frog Kiss / Water Jet on the parrot to grind some of it's health, and self healing if manageable.
However on the first transformation of Frog Kiss, the parrot switch to the robot, Swabbie.
• Obs.: If Frog Kiss never procs, can still try to do some turns of damage to parrot with the 2 first pets, or reset the fight. The trick with Frog Kiss, while doing a nice damage, is "forcing" the enemy team to swap, thus always losing a turn without damaging us.

The robot will soon use it's Barrel Toss skill to prepare the object and again next turn to do heavy damage. Or his Explode skill, killing itself while doing some damage to the front pet.
By this time the Jungle Darter will be dead (by this explosion or simply by pure parrot brutality), so I switch to Magical Crawdad.
This magical heavenly being needs to stay on defensive with Shell Shield and using Wish whenever possible, just to survive parrot's onslaugh long enough so for his Surge little by little but surely get the best of the enemy.

At some point both team's 2 pets are down. Comes the last enemy, Cannoneer, the bomb-crab.
This crab starts with Bombing Run, minor damage + a time bomb debuff with normal damage after 3 turns.
Then it alternates between Snap (same damage as the time bomb) and Deep Snap, a 1 round cooldown starting with minor damage but increasing each use.
As it being a H/H breed with 1938 hp, it sure lasts to grow it's packer skill.
• Obs.: If you have another pet with evasive skills, use it to counter this Deep Snap when it is stacked, by the 4-6th use is already a killer move).

To fight the crab I enter Pengu (or could do Tundra Penguin, same skill set).
Important to start with Slippery Ice, giving a -20% accuracy debuff for 4 turns, with some luck simply avoiding the bigger damages.
While the crab hits and misses, just spam Peck to deal bonus damage.

If the crab already had took some damage prior to Pengu, this will be enough and crab dies before it smashes you.
If not, can try to "prepare" the Magical Crawdad's Wish to heal Pengu subsequently, maybe even spare him for this if possible.