From the Super Mario Wiki, the Mario encyclopedia
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Regen Goobs are rare ghosts in Luigi's Mansion 3. They are a rare variety of Goobs which appear in ScareScraper mode. They have 250 HP, more than double that of a regular Goob's. They are defeated the same way as normal Goobs. If released before defeated, however, they begin to quickly restore or regenerate HP, hence Regen.