101Leafy researched the game with the Hilltop Works fan translation patch, English translation by Cargodin
Bone Pail骨鉄桶
Bone Pail is row 54 of the game's guilü table, with the elements Tree and Earth. It has more than one element, so the game gives it no weakness.
It drops nothing and has no random battles, like every guilü with more than one element: it is fought in a set battle.
Guilü table: Meridian Face Bone Pail Wheel Mask
English translations by Cargodin for Hilltop Works Fan Translation Patch: https://www.patreon.com/hilltopworks/posts/kowloons-gate-160555525?collection=18503