*There is no creatures with this flag in core. So if you have custom content, you can use this:
update creature_template set flags_extra = (flags_extra | 0x00000100) where flags_extra & 0x00010000;
update creature_template set flags_extra = (flags_extra & ~0x00010000) where flags_extra & 0x00010000;
--HG--
branch : trunk