From the Super Mario Wiki
Strong Gobbers are variations of Gobbers that appear in Luigi's Mansion: Dark Moon. Like all of the other stronger versions of ghosts, it has white stripes running across its body. It was made stronger by being exposed to a special crystal found in the Crystal Quarry. Due to their enhanced attributes, Strong Gobbers have 200 HP.
A Strong Gobber makes an appearance as a sub-boss along with a Strong Slammer and a Strong Greenie in the third mission, Across the Chasm. Like the other two sub-boss ghosts, it has paranormal chains wrapped around its body and possesses the ability to create more in order to block an entrance. These Paranormal Chains break upon the ghost's defeat. It uses its abilities to prevent Luigi from accessing the Gondola, before hiding in the Basin. The sub-boss Strong Gobber must be stunned by using a hidden Robomb, and three Hiders must be captured before it reveals itself. Unlike other Strong Gobbers, it has 300 HP.
Ghost Container description
These massive, disgusting ghosts can destroy an entire mansion before you can say "Criminy! That's gross!" ("Flying Phelm!" in PAL regions) Watch out for their flying goo, or you'll have a hard time capturing them.
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