This page explains how to solve the quest "Battle Beetle" in Yo-kai Watch.

Start the Quest

Go into Jungle Hunter in the southeast of Uptown Springdale and talk to the guy to start the quest.

Catch a Rhino Beetle!

You have to catch a Rhino Beetle to complete this quest. You can find them on trees in the mountain path of Mount Wildwood (northwest of the shrine). The quest giver won't accept rare Rhino Beetles. You will get a rare one if the spinning arrow lands on a red mark, so try to avoid that.

Quest Complete!

After you have a Rhino Beetle, go back to the guy in Jungle Hunter and talk to him to complete the quest.