Clash of Captains
From the Super Mario Wiki
Clash of Captains is the ninth captain command in the Minion Quest: The Search for Bowser mode of Mario & Luigi: Superstar Saga + Bowser's Minions. It costs six CP to use. When used, the captain will challenge the opposing captain to a one-on-one battle, but not before proceeding to take damage from the allies that try to stop him. The move (and the battle) ends when one of the captains is defeated. Captain Goomba and Private Goomp are the only ones that can use it.