Shiny Pet Charm

Shiny Pet Charm is a quest reward from Battle Pet Roundup / Scrappin', which are started by Lio the Lioness and Serr'ah (respectively) at a Level 1 / 2 Menagerie in the Garrison, and from the daily pet battle quests on. At a Level 3 Menagerie, the daily quest is exchanged for Mastering the Menagerie that rewards you with a Big Bag of Pet Supplies, containing Pet Charms.

Fel-Touched Pet Supplies also contain a few charms. The bag comes from defeating the Tanaan Jungle legendary pets.

Earning 500 of these will reward the achievement Shiny Pet Charmer.