Light Flash◆ (concentrate, light) The flash beetle creates a brilliant flash of light. All creatures in its luminescent aura must succeed at a DC 17 Fortitude save or be Dazzled for 1 minute.
The flash beetle's glow then goes out, disabling its aura for 24 hours, during which time it cannot use Light Flash.
Source: Pathfinder Monster Core
Running this fight? Add the flash beetle to the initiative tracker: type its name and the AC, hit points and Perception for initiative fill in, and the book button shows this stat block mid-fight.