Stock Mecha Knights are mass produced robots made to emulate the fighting style of the original Mecha Knight, which is a mechanized version of Meta Knight. They were produced as security guards by the Haltmann Works Company during the mechanized occupation of Planet Popstar.
Kirby: Planet Robobot
One unit can be seen during the "Meta Knightmare Returns" mode, where it replace the original Mecha Knight as the boss of Gigabyte Grounds since Meta Knight is the player controlled character during this mode. It is also fought in The True Arena instead of the regular Mecha Knight or the + version.
Kirby: Planet Robobot pause screen
This mass-production model is based on an upgraded Mecha Knight model. If this model goes into commercial production, the company's military power will dramatically increase.