Ironclad Helmet Squad
From the Super Mario Wiki
Ironclad Helmet Squad is a level in Blubble Lake in the Bowser Jr.'s Journey mode of Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey.
This level has three battles. The first round has Buzzy Beetles up front with Spike Tops replacing them in the second round. There is a Para-Beetle in the middle in both rounds, while behind them is another Para-Beetle and a Green Magikoopa which swap places in each round. The third round has Para-Beetles up front with two Spike Tops behind the middle one.