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Junker Can X appears within Bowser's Body located in the Challenge Node, along with Junker X in the game Mario & Luigi: Bowser's Inside Story. They have the same battle tactics as the original Junker Cans, just much stronger and faster. Junker Can X also differs in color of the original version, being brown with pink eyes unlike the silver/blue color combination with yellow eyes.
They will attack by getting close to the plumbers, trying to slam them, but this attack can be countered by using the Hammers. However, they will stop short if they see the hammer, and then close its lid, preventing them from taking damage; they must be countered as quickly as possible, but not too quickly. Junker X may occasionally pick up Luigi and throw him in a Junker Can X, and he cannot get out until Mario hammers and defeats the Junker Can X holding him. If Mario is defeated with Luigi still trapped, the can will drain Luigi's health and KO him as well.
If Mario and Luigi do defeat a Junker Can X, a Fish Bone, Chain Chomp, or Nooz will head for the plumber that attacked it.