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Had an idea for a mythology based Pokémon. It's a small floating glowing orb called Willowis (will o' the wisp) that dwells in marshes. it can evolve into lanternal (lantern man), when many come together to form a physical sort of body donning a cloak and shining brightly.
Or, it has a varient that evolves into a floating firey glowing animal head based on nukekubi/sogenbi, growing in size to an actual animal head. It then evolves finally into a Pokémon based on maikubi where three of the previous evolutions (becoming more aggressive) merge into a single floating being with an intense fire and three heads poking out. These would be spotted near the sea and constantly turning like a UFO because the heads are turning around trying to bite and snap at each other.