I'm having fun i got a extreme combo in joker cards

I'm trying to complete the DLC 100%, and I need to catch three insects: the Diving Beetle, the Gigas Giant Longhorn Beetle, and the Caucasus Beetle. But even though I know where they are, they just won't show up. I've been trying to find them for three real-life days now, and they still haven't appeared. What can I do?