From the Super Mario Wiki, the Mario encyclopedia
Mega Mechakoopa is a larger variant of a Mechakoopa that first appears as a miniboss in Mario Party 10. The Mega Mechakoopa one of the game's mid-bosses. In its boss minigame Mega Mechakoopa's Swing & Stomp, players must ride up elevators and swing on suspensions hanging from the ceiling to jump on the Mega Mechakoopa's head and deal damage. As its health dwindles, the Mega Mechakoopa will begin moving more erratically and breathing fire to try and catch players off-guard.
They later make an appearance in Super Mario Maker 2, being created by enlarging a Mechakoopa with a Super Mushroom. They act the same as their smaller counterparts, right down to using jet engines in the Nighttime setting, but cannot be picked up.
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