1. Have lvl 3 garrison.
2. Enable [Creepy Crawlers] http://www.wowhead.com/item=128664/creepy-crawlers decorations, so the battle pets spawn in your garrison.(need to do couple of quests)
3. Kill ghostly critters with some sort of aoe like death and decay. Repeat.
4.????
5. profit
http://i.imgur.com/AMtLPWA.jpg
Useful for http://www.wowhead.com/achievement=5...ter-kill-squad
[Added]
There is a spot where two critters spawn near each other. Its right next to the Arachnis rare mob that spawns with decorations.
2. Enable [Creepy Crawlers] http://www.wowhead.com/item=128664/creepy-crawlers decorations, so the battle pets spawn in your garrison.(need to do couple of quests)
3. Kill ghostly critters with some sort of aoe like death and decay. Repeat.
4.????
5. profit
http://i.imgur.com/AMtLPWA.jpg
Useful for http://www.wowhead.com/achievement=5...ter-kill-squad
[Added]
There is a spot where two critters spawn near each other. Its right next to the Arachnis rare mob that spawns with decorations.