Originally Posted by blitzy

alright, 1st you need the yellow human shaped paper thinggy sell at the drugstore (cost 1k ea). Now find any mob that you want to catch, get the mob hp lower than half(lower hp = better success rate) double-click the yellow thingy and click on the mob. Now if you success, you will get the mob into the pandora box.(only 1 pet at a time)

However, you can ONLY summon the pet during quest event, to help you in boss fight.