Gargra

Easy fight. This is the setup I've been using for some days:

1: Cogblade Raptor S/S (2,1,1)
2: Carry Pet
3: Darkmoon Zeppelin (1,1,2)

vs Wolfus
- Expose Wounds, Batter until Wolfus dies.

vs Fangra
- Overtune, Batter until your Cogblade Raptor dies.
- Switch to your carry pet, switch to Darkmoon Zeppelin.
- Missile until Fangra dies.

vs Wolfgar
- If your Cogblade Raptor is still alive, Batter until it dies. Switch to your carry pet, switch to Darkmoon Zeppelin.
- Decoy, Missile until Wolfgar dies.

The fight against Gargra doesn't look that bad at first, three Beasts which Mechs can counter nicely (like in jensketch's comment). However, she offers a moderate challenge if you have lowbie pet in your team for leveling purposes or if you are going for An Awfully Big Adventure. For the achievement you don't actually have to use the [npc=82464], it can just hang around in team without ever participating the battle, but not in this one. All her pets are beasts so beating her with two level 25 pets isn't very hard with the right setup.

I used the following pets against her:

[npc=34587] with

• 
  
• [petability=777]
• 
  
• [petability=634]
• 
  
• [petability=392]
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and [npc=68841] (#5 S/S to outspeed Wolfgar) with

• 
  
• [petability=455]
• 
  
• [petability=389]
• 
  
• [petability=305]
• 
  

Lowbie requirements: None

The course of the battle:

1. 
   
2. Start with your [npc=34587] and drop [petability=634] to the field.
3. 
   
4. Since [npc=87970] always starts with [petability=536], you'll want to use [petability=392] next to negate some of the incoming damage spike a bit.
5. 
   
6. Three [petability=777]s are needed to defeat Wulfus. In best scenario, your Bot ends up with 600ish HP left or in the worst, it's dies and resses with the Mechanical racial. Note: Sometimes RNG plays tricks on you and you need fourth Missile to beat Wulfus. It difficults things a bit, but doesn't necessarily require a restart. When the next pet enters, don't pass the first turn like step 4 states, instead drop the second Minefield followed by Extra Plating and resume the instructions.
7. 
   
8. When [npc=87968] enters, a Missile would kill her but we want another Minefield for the last wolf. So pass one turn instead and then cast another Extra Plating for the coming [petability=360]. Minefield cooldown is ready at this point so drop another set of those sweet things when your Bot is hit by the first Flurry on the same turn. Try if your Bot can survive the second Flurry and finish off Fangra with a Missile. If the Bot dies before doing so, swap in [npc=68841] (otherwise proceed to the next step). First cast [petability=389] to outspeed Fangra and make a pelt out of her with [petability=455].
9. 
   
10. Having Fangra beaten, [npc=87967] will enter and you need to swap in your carry pet or [npc=82464] to soak the [petability=362]. Then swap back your Warbot if it's still alive, Raptor otherwise, and soak the [petability=345]. Warbot won't probably survive from this but at this point it requires only 1-2 Batters to beat the wolf which is as easy as shooting fish in the barrel with a shotgun.
11. 
    

Last tested to work in build: 19243

I beat this fight with 2 pets, a level 25 P/P [npc=77221] (1/2/1) and level 25 H/P [npc=55356] (1/1/1). I did not have to bring a third pet out.

Opened with Wind-Up, Supercharge, Wind-Up to defeat Wolfus. Wind-Up, Wind-Up to put a dent in Fangra. Fangra will Dodge, so your next move with the Iron Starlette does not matter. Bring out the Darkmoon Tonk and use Missile to take out Fangra. When Wolfgar comes out, use Shock and Awe. Stun is not needed. Next, use Lock On twice to take Wolfgar out.

Using this strategy, I ended the fight with the Starlette dying and the Tonk remaining with half health.

Also, if you have [item=119093], you can reach Gargra extremely quickly from your garrison as Horde. If your Feather is up after beating Gargra, you can aim carefully and navigate through the rocks to get most of the way to Cymre Brightblade.

Update: If you have a Tonk and a leveling pet that can survive a hit, there is a better way. Send the Tonk out first, use Shock and Awe. Keep resetting until you get a stun. Use Missile and Shock and Awe on cooldown until Wolfus and Fangra are down. Use Lock On against Wolfgar until the Tonk dies. Bring out your leveling pet now. Next, switch to any mechanical pet to finish off Wolfgar (I used a Starlette with Toxic Smoke).