Drilling Down

Unborn Valkyr - 1, 2, 1
Ikki - 1, 1, 1
Amalgam of Destruction (any elemental attacks really) - 1, 1, 1

Sorry I don't know the cool formatting.

Opponent is Mechanical.
Easily soloed with a level 1 team of Elemental pets.

Level 25 rare teams:

Humanoid:
1st Pet: [npc=68846]: Use [pet-ability=416] + [pet-ability=481] + [pet-ability=221] combo once. Runt dies after.
2nd Pet: [npc=73741]: Use [pet-ability=624] once. (This should go off right after enemy's repair heals him.) Spam [pet-ability=206] > [pet-ability=413] until Rotten helper dies.
3rd Pet: [npc=15698]: Finish Powerdrill with [pet-ability=206] > [pet-ability=413] spam.

Dragonkin:
1st Pet: [npc=97205]: Use [pet-ability=779] first and follow with [pet-ability=204]. Stormborne dies next turn.
2nd Pet: [npc=97207]: Use [pet-ability=624]. (This should go off right after enemy's repair heals him.) Use [pet-ability=592] and swap to 3rd Pet.
3rd Pet: [npc=40624]: Spam [pet-ability=860] until Celestial Dragon dies.
2nd Pet again: Use [pet-ability=624] and spam [pet-ability=429] until Powerdrill dies. (Claw procs mech racial and Ice Tomb kills the drill right after.)

Flying:
1st Pet: [npc=222614]: Use [pet-ability=270] once and spam [pet-ability=581].
2nd Pet: [npc=143564]: Use [pet-ability=919] once and spam [pet-ability=581].
3rd Pet: [npc=86447]: Use [pet-ability=919] once and spam [pet-ability=581].

Undead:
1st Pet: [npc=115146]: Use [pet-ability=786] when possible and [pet-ability=943] as filler.
2nd Pet: [npc=53232]: Use [pet-ability=592] once and spam [pet-ability=501] until powerdrill dies.
3rd Pet: Any undead, I had [npc=71163], but didn't need it.

Critter:
1st Pet: [npc=189099]: Get [pet-ability=2495] and [pet-ability=167] up and running and buff them with [pet-ability=592] after.
2nd Pet: [npc=59358]: Spam [pet-ability=163].
3rd Pet: [npc=98077]: Use [pet-ability=503] once and finish powerdrill with [pet-ability=113].
Note: Any rabbit works, but rabbit with >338 speed works even better.

Magic:
1st Pet: [npc=71021] (#3 B/B): Use [pet-ability=212] first and [pet-ability=218] after. Use anything 3rd turn, Voidcaller dies.
2nd Pet: [npc=96405]: Use [pet-ability=1068] and swap to 3rd pet.
3rd Pet: [npc=220420]: Spam [pet-ability=163] until Remember Riverpaw dies.
2nd Pet again: [npc=96405]: Use [pet-ability=1068] and spam [pet-ability=184] until Powerdrill dies.
Note: Slight Quill rng. You cast Quills four times and one of those needs to hit an extra time. If your Voidcaller is not one of the +dmg breeds, you might need better Quills rng.
Note 2: [npc=212267] and [npc=212273] should be fine alternatives for Riverpaw.

Elemental:
1st Pet: [npc=23909]: Start with: [pet-ability=745] first, [pet-ability=113] second and [pet-ability=402] third. (Drill will be stunned when repair ends and gets no healing from it.) After that [pet-ability=745] when available and [pet-ability=113] as filler.
2nd Pet: Any Elemental with Elemental damage, I had [npc=47944]: Use [pet-ability=178] once for dot and finish Drill with [pet-ability=179] and/or [pet-ability=113].
3rd Pet: Any Elemental, I had [npc=15710], but didn't use it.

Beast:
1st Pet: [npc=62184] (#5 S/S): Use [pet-ability=159] followed by [pet-ability=152] and [pet-ability=155] after. Swap to 2nd Pet.
2nd Pet: [npc=115135]: Use [pet-ability=1559] to stop repair heal and toss [pet-ability=270] up. Cast anything, Dreadmaw dies.
1st Pet again: [npc=62184] (#5 S/S): Use [pet-ability=159] and [pet-ability=155]. Rock Viper dies.
3rd Pet: [npc=115135]: Start with [pet-ability=501], use [pet-ability=1407] once. Next interrupt enemy healing with [pet-ability=1559]. Use [pet-ability=1407] a second time. Powerdrill dies.
Note: It's very close and sometimes Burrow's don't quite deal enough damage and powerdrill doesn't die. Go agane.
Note 2: First Dreadmaw has interrupt and glowing toxin. Second Dreadmaw has interrupt and fire stuff.

Aquatic:
1st Pet: [npc=86879]: Start with [pet-ability=513] and [pet-ability=204] after. Hydraling dies next turn.
2nd Pet: [npc=154706]: Combo [pet-ability=919] with [pet-ability=706]. ChittySkitty dies next turn.
3rd Pet: Any Aquatic pet with high hp or elemental damage. I.e. [npc=113136] spam [pet-ability=118] or [npc=29726] spam [pet-ability=528].

Mechanical:
1st Pet: [npc=48609]: Use [pet-ability=712] once and follow with [pet-ability=710]. Clockwork dies next turn.
2nd Pet: [npc=68841]: Get [pet-ability=305] up first, then [pet-ability=357]. Use [pet-ability=455] twice. Refresh [pet-ability=305] and [pet-ability=357].
3rd Pet: [npc=73011]: Start with [pet-ability=985] and kill the drill with [pet-ability=1002].