The Beastly Bean Battalion
From the Super Mario Wiki
The Beastly Bean Battalion is the secret level of Bowser's Castle in the Minion Quest: The Search for Bowser mode in Mario & Luigi: Superstar Saga + Bowser's Minions. In order to obtain this level, the player has to use certain amiibo to unlock it.
The level consists of mostly unrecruitable enemy troops and has six battles. The first battle has a Rex, an Elite Chuck Guy, a Beanie, an Elite Pestnut, two Paratroopeas, a Piranha Bean, and a Mecha-Fawful X captain. The second battle has a Gritty Goomba, a Sharpea, three Scaratroopeas, two Starkisses, and a Mecha-Fawful Y captain. The third battle has a Limbo Bro, a Tanoomba, a Parabeanie, four Fuzzbushes, and a Mecha-Fawful Z captain. The fourth battle has an Elite Limbo Bro, two Beanies, a Troopea, two Lakipeas, a Beanerang Bro, and a Mecha-Fawful X captain. The fifth battle has a Clumph, an Elite Troopea, a Scaratroopea, two Paratroopeas, two Ice Snifits, and a Mecha-Fawful Y captain. The sixth and final battle has a Pestnut, a Chuck Guy, a Paratroopea, two Piranha Beans, a Starkiss, a Beanerang Bro, and a Mecha-Fawful Z captain.