Fist-Force Combobot

The Fist-Force Combobot is a treasure in. It is the right arm of a toy robot.

Collecting the treasure
The Fist-Force Combobot is inside of a jar to the far west of the Hero's Hideaway, right after the bottom step of the stairs that divide the rooms. To collect it, you must break the jar with a rush from Oatchi; then, throw 5 Pikmin at it.