Castform

Castform is an artificial Pokémon that changes appearance and attitude based on the weather. Its body is made of cells exactly like those of water molecules, causing its cellular structure to be chemically altered by temperature and humidity. Though not of its free will, Castform uses this ability to protect its tiny body. In its Normal form, it resembles a plain, gray cloud with a single wisp extending from the top of its head.
Under bright sunlight, it takes on its Sunny Form. Its lower half becomes pure white, while the head turns orange has develops small orange spheres around it. This gives it the overall appearance of the sun above a small cloud. Its skin glows and dries, and becomes hot to the touch.
When it is soaked in rain, it takes on its Rainy Form. It has a dark gray lower half resembling a storm cloud. The head turns blue and resembles a raindrop. Its body is soft and slippery and seeps with water when compressed.
When it is hit by hail, it takes on its Snowy Form. Its head turns purplish-blue. The rest of the body changes into the shape of a mint green, cumulonimbus cloud. Its body becomes a smooth ice-like material, partially frozen measuring temperatures near 23 degrees Fahrenheit.
Regardless of the form it takes, it will always have a large, spherical head and a lighter-colored mask-like marking over its eyes. Various experiments were conducted to change its form in artificial conditions, but all have failed. Despite its man-made origins, it can be found in grassland areas.

Castform

Although its form changes with the weather, that is apparently the result of a chemical reaction and not the result of its own free will.

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Armor Class	15
Hit Points	2d4-2
Speed	10 ft.	20 ft. Fly (hover)
Strength	13 (+1)
Dexterity	13 (+1)
Constitution	13 (+1)
Intelligence	8 (-1)
Wisdom	13 (+1)
Charisma	13 (+1)
Damage Resistances	See Forecast
Senses	Passive Perception 10
Languages	Common
Challenge	0 (10 XP)
Special	Forecast	Castform’s appearance and damage resistances	change depending on the weather.
In bright, sunny weather Castform gains fire resistance.	In rainy weather, Castform gains	resistance to bludgeoning damage.	In cold weather, Castform gains
resistance to cold damage.	In normal, mild weather,	Castform has no resistances
Action 1	Ember /Powder Snow/ Water Gun	Ranged Weapon Attack	d20+2 to hit
Range 10/30 ft., one target	Hit 1d4 damage of the same type	of damage resistances it has through Forecast.	If Castform is in mild weather, it can’t use this action
Action 2	Rain Dance	Castform changes the weather within 1 mile.	The weather becomes rainy for 1 hour
Action 3	Sunny Day	Castform changes the weather within 1 mile.	The weather becomes bright and sunny for 1 hour