From the Super Mario Wiki
Strong Sneakers are a type of Sneaker in Luigi's Mansion: Dark Moon, powered up by a special crystal. It is the first Strong ghost encountered in the game, first seen in Old Clockworks. Strong Sneakers have 100 HP, though some in a few missions may have only 50. The player is advised to look for abnormalities in the particles of sand or snow. Strong Sneakers can be revealed before they scare Luigi by using the Dark-Light Device. If they scare Luigi, the player can use the Strobulb almost immediately, facing the way the Strong Sneaker is located, to stun and catch them. Strong Sneakers break out of their crystal by using a laser-like finger.
Ghost Container description
This guy is trouble! He's tougher and meaner than a normal Sneaker, and all those marks on his body are bristling with power!
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