Steel Mechorilla

The Steel Mechorilla is a boss in Chapter 7 of Mother 3. After the Masked Man pulls Lydia's needle on Snowcap Mountain, he leaves the Steel Mechorilla to attack Lucas and company. Upon its defeat, Lucas can receive Lydia's memento and use a shortcut to return to Tazmily Village.

Battle Memory description
"A construction Chimera designed to destroy the old Chimera Lab to make way for a new building."