Mechanical Melee

For [npc=128019], this is very easy. Tactics from awesome Xu-Fu.

[npc=77221] 1,1,2
[npc=64899] 1,1,1 (yes, Explode and not Decoy!)
Any mechanical pet

1. Wind-up
2. Wind-up
3. Explode. Iron Starlette dies - bring in your Mechanical Pandaren Dragonling
4. Breath
5. Breath
6. Explode

My team vs. Gnasher:

• 
  
• Stonegrinder (2,1,1)
• 
  
• Anodized Robo Cub (1,2,1)
• 
  
• Lifelike Mechanical Frostboar (1,2,2)
• 
  

Strategy by Round:

1. 
   
2. Start with Stonegrinder and use woodchipper to make Gnasher bleed.
3. 
   
4. Switch to Anodized Robo Cub.
5. 
   
6. Maul
7. 
   
8. Bite
9. 
   
10. Bite (Cub dies - bring in Frostboar)
11. 
    
12. Headbutt
13. 
    
14. Pig Out
15. 
    
16. Charge
17. 
    
18. Charge (Gnasher dies)
19. 
    

For Gnasher:
Anodized Robo Cub: 1, 1, 1
Cogblade Raptor: 1, 2, 1
Tranquil Mechanical Yeti: 2, 2, 2

Open with Maul then Bite until the Cub dies.
Bring Raptor and use Screech then Bite until dead.
Finalize with Trash or Ion Cannon.