Before you start this Event make sure that you do not have a pet with you, you have 4 or less pets in your ranch, and you do not have any NPC's in your party.
Enter Duma Desert. Go Right and talk to Tikkle. Agree to help him and work your way to area 23 on the map.
Fight and defeat Kima to end this Event.
Upon Completion: Return home, talk to Lil' Cactus, go downstairs (watch him write the Event on the leaf), and go back upstairs to save your game before continuing.