Shy Guy Airtub
From the Super Mario Wiki
The Shy Guy Airtub is an enemy that appears in Mario & Luigi: Dream Team. They appear in areas relevant to the Ultibed part hunt. Due to it being a background enemy, it doesn't appear on the field, so a Taunt Ball must be used to fight the Airtub head-on when it appears; defeating the Shy Guy Airtub lets the player fight the three Shy Guys that were riding them. The Shy Guy Airtub R is a strong variant that can be found much later in the game, as is the Shy Guy Airtub DX.
Shy Guy Airtubs reappear in Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey as part of Bowser Jr. (Flying)'s captain command Shy Guy Swarm, where they attack all enemies that have been targeted beforehand. However, they can also hit allies if they are targeted beforehand.
Three red Shy Guys riding on a mini-airship with two cannons on each side and a big one in the front.
The Airtub attacks differently depending on whether it is in the foreground or background. When it is in the background, they use the two cannons on one side to fire cannonballs at Mario and Luigi. If a cannonball is fired out of the left cannon, Mario must hammer it back at them. If fired out of the right, Luigi must hammer it back at them. Defeating the Shy Guy Airtub in the background will make it simply crash there, send the Shy Guys flying from the crash and into the midst of battle. This does not damage the enemies currently in battle.
If lured into the foreground by a bro throwing a Taunt Ball at them and thus enraging the Shy Guys, they will make the Airtub attack by firing two giant spiky balls out of the giant cannon, one at each bro one after another. The majority of the three Shy Guys will point at who will be fired at first. Mario and Luigi must hammer the ball back at the Airtub in order to do plenty of damage to it. If the Airtub is defeated through countering this attack, it will crash into the ground; damaging and likely defeating other enemies Mario and Luigi were fighting. This then allows the Bros. to fight the three Shy Guys that were controlling the Airtub.
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