I'm not sure what you mean by this, but you catch UB-02 Beauty right after UB-01 Simb (idk how to spell the UB-01)
in Verdant Cavern. You can find UB-01 Simb in Diglet Cave/Vela Mountain if you haven't caught it yet. After you catch UB-02 Beauty, catch Xerkitree. Go back to Looker, tell him you finished the mission, then they'll tell you that you can find UB-04 Blaster in Haina Desert/Malie Garden. UB-02 Beauty and UB-04 Blaster are exclusive to moon.