It passively fly above the ground while dropping fireballs made of flaming chunks of its desiccated skin. They are constantly on fire and the only way to kill them is by sending a Red Pikmin at it. It will die as soon as the Red Pikmin hit it.
Hey! Pikmin log
"This evolved Fiery Dwarf Bulblax has taken flight, it seems. It rains down flaming chunks of desiccated skin, an attack as effective as it is disgusting. Though given the nature of its projectiles, perhaps it doesn't mean to attack at all?"