Chain Chawful

Gerawanwan are Chain-Chomp enemies possessed by a parasitic green Sworm with Fawful's face that appear in Mario & Luigi: Bowser's Inside Story. When they try to attack, Bowser can counter-attack by withdrawing into his shell or punching them. When the Sworms take on damage, they will hide in the Chain-Chomp. When not hiding, Bowser can use his Vacuum ability to suck out the Sworm. This returns the Chain-Chomp to normal and ends the battle without any EXP gained.