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Pet Battle Challenge: Wailing Caverns
Complete Pet Battle Challenge in Wailing Caverns.
Complete the Pet Battle Challenge in Wailing Caverns to earn this 5-point achievement and receive the 
Son of Skum pet.
Talk to Muyani to start
Locate Muyani outside Wailing Caverns to pick up the initial quest, then enter the dungeon and defeat all the battle pets inside.
Leave instance after completion
After defeating all pets inside, click your portrait and select 'Leave Instance Group' to be returned to Muyani — you must turn in this initial quest first before the achievement becomes available.
Pick up and complete the daily
After turning in the initial quest to Muyani, pick up the daily version of the quest and complete the dungeon a second time — this second run is what triggers the achievement and awards the 
Damp Pet Supplies.
Prepare recommended pets
Bring pets suited for the dungeon, including Waterfly (2,1,2), Nordrassil Wisp (2,2,2), Ikky (2,1,1), Darkmoon Zeppelin (1,1,2), Sunreaver Micro-Sentry (2,2,1), Clockwork Gnome (1,1,1), Darkmoon Tonk (1,1,2), two Scourged Whelplings (2,1,1), and Mechanical Pandaren Dragonling (1,2,2).
Alternative: use Zandalari pets
Zandalari Anklerender, Zandalari Kneebiter, or a mix of both can carry you through the entire dungeon using Black Claw and Hunting Party as your two primary abilities, with Leap as the recommended third ability to outspeed enemies.
Tips
The Rematch addon can store pre-built teams for each fight in the dungeon, which reduces setup time on repeat runs for the daily quest.