Purple keys you get only from CERTIAN lvl 10+ monster drop events (e.i; igg's birthday pack, christmas stocking. new years pack etc...) or from credit mall.
Picklessssssssssssssssssssss!~
See more on Know Your Meme
[Guide] Level Planner for Player and Pet Training - http://wlodb.com/topics/13527
[Guide] Ultimate Pet Page - http://wlodb.com/topics/15272