castform-sunny #10013
Type Matchups
Weak to (2x damage):
Resistant to (½x damage):
castform-sunny
Generation III · #10013 — Weather Pokémon
Castform, the Weather Pokémon, is a remarkable Generation III Pokémon that defies conventional classification through its unique Forecast ability, which fundamentally alters its type and form based on environmental conditions. The Sunny Form represents Castform's Fire-type transformation, occurring during periods of harsh sunlight in battle. Introduced in Pokémon Ruby and Sapphire, Castform stands as one of the most fascinating examples of weather-dependent mechanics in the Pokémon franchise, boasting perfectly balanced base stats of 70 across all six stat categories for a total of 420. This diminutive Pokémon, measuring only 0.3 meters tall and weighing a mere 0.8 kilograms, demonstrates that raw power is not always necessary when adaptability and environmental synergy are paramount.
Base Stats
Height
0.3m
Weight
0.8kg
Category
Weather Pokémon
Gender
Male 50% / Female 50%
Color
gray
Shape
ball
Habitat
grassland
Abilities
Changes castform's type and form to match the weather.
Castform-sunny Biology & Physical Characteristics
The Sunny Form of Castform represents a dramatic transformation from its normal gray cloud-like appearance into a brilliant, sun-inspired configuration. According to Pokédex entries, Castform's cellular structure is chemically composed of molecules identical to water, allowing temperature and humidity fluctuations to fundamentally alter its physical form and composition. In its Sunny Form, the Pokémon assumes a Fire-type classification and demonstrates an ability to harness the vast power of nature through solar radiation, converting the sun's energy to protect its otherwise vulnerable, diminutive body. The transformation is not merely cosmetic; the shift to Fire-type status reflects genuine changes in Castform's molecular arrangement and energy composition. This adaptive capability represents an artificial evolution of sorts, where the Pokémon's body naturally responds to external stimuli without conscious control, making it a unique example of environmentally-triggered metamorphosis among artificial Pokémon. The water-based molecular structure proves remarkably flexible, able to transition seamlessly between Fire, Water, Ice, and Normal types depending on prevailing weather conditions.
Pokedex Numbers
Training
Breeding
Castform-sunny Breeding, Gender Ratio & Egg Groups
Castform exhibits a perfectly balanced 50% male to 50% female gender ratio, offering equal breeding potential regardless of the parent's sex when used in breeding chains with compatible partners. The Weather Pokémon belongs to two egg groups—the Fairy and Amorphous groups—providing trainers with flexibility in planning breeding strategies and creating hybrid movesets through egg move inheritance. Female Castform can produce offspring when paired with any compatible male Pokémon from either the Fairy or Amorphous egg groups, while males similarly contribute genetic material to eligible females from these same categories. With a base friendship of 70 and a hatch counter of 25 cycles, representing approximately 6,169 to 6,425 steps, Castform eggs require moderate time and effort to incubate before hatching. The species' medium-fast growth rate means that Castform reaches higher levels at a steady pace, neither accelerating dramatically like fast-growing Pokémon nor progressing slowly like late bloomers, making it accessible for trainers seeking reasonably quick team development. The Amorphous egg group classification reflects Castform's artificial composition and water-molecule-based biology, while its Fairy egg group membership suggests connections to mystical, nature-based forces despite the Pokémon's fundamentally artificial origins.
Held Items
Sprites
Held Items
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
mystic-water
type-enhancement
Held: Water-Type moves from holder do 20% more damage.
Cost: 1000
TMs & HMs
tm01
lets go pikachu lets go eevee
tm01
ultra sun ultra moon
tm01
sun moon
tm02
crystal
tm02
gold silver
tm03
ruby sapphire
tm03
platinum
tm03
firered leafgreen
tm03
heartgold soulsilver
tm03
diamond pearl
tm03
emerald
tm03
xd
tm03
colosseum
tm05
lets go pikachu lets go eevee
tm06
yellow
tm06
gold silver
tm06
red blue
tm06
crystal
tm06
emerald
tm06
firered leafgreen
+663 more TMs/HMs
Castform-sunny Evolution, Mega Evolution & Special Forms
Castform does not evolve into or from any other Pokémon species, nor does it possess a Mega Evolution form despite being introduced in Generation III when Mega Evolution mechanics were not yet established. The Weather Pokémon's entire evolutionary concept revolves around form transformation rather than traditional evolution, with the Sunny Form being one of three weather-dependent variations alongside the Rainy Form and Snowy Form. This design philosophy reflects the developers' intention to create a Pokémon whose strength lies in adaptability rather than progression through linear evolutionary chains. The Forecast ability represents the true extent of Castform's developmental potential, and mastering the Sunny Form's Fire-type capabilities and corresponding movepool constitutes the full extent of what this Pokémon can achieve in terms of powered-up forms. While Castform maintains identical base stats across all its forms, suggesting no inherent mechanical advantage to any particular transformation, the Sunny Form's Fire-type classification provides access to a completely distinct array of moves and strategic applications compared to its Normal-form counterpart.
Where to Find
Location data not available for this Pokémon in the database.
Castform-sunny Behaviour and Natural Habitat
Castform in its Sunny Form exhibits behavioral characteristics distinctly influenced by the bright, warm conditions that trigger its transformation. The Pokédex notes that Castform's feelings change with the weather, suggesting that its personality and demeanor become noticeably more energetic and aggressive when basking in harsh sunlight. This form typically appears in arid, sunny regions where intense solar radiation is prevalent throughout the day. Castform borrows the power of nature to transform itself, indicating a somewhat parasitic relationship with environmental forces—the Pokémon is not generating its Fire-type energy independently but rather channeling ambient solar power through its body. The tiny creature's vulnerability makes it reliant upon favorable weather conditions for survival and combat effectiveness, as the sun provides both the catalyst for its transformation and the energy source sustaining its Fire-type abilities. During sunny weather in its natural habitat, Castform becomes considerably more confident and combat-capable, though it remains fundamentally dependent upon external conditions rather than internal reserves of power.
Pokedex Entries
Generation III
CASTFORM’s appearance changes with the weather. This POKéMON gained the ability to use the vast power of nature to protect its tiny body.
CASTFORM borrows the power of nature to transform itself into the guises of the sun, rain clouds, and snow clouds. This POKéMON’s feelings change with the weather.
It alters its form depending on the weather. Changes in the climate such as the temperature and humidity appear to affect its cellular structure.
It has the ability to change its form into the sun, the rain, or a snow cloud, depending on the weather.
Generation IV
Its appearance changes with the weather. Recently, its molecules were found to be just like water.
This Pokémon can change its cells, taking different forms based on the temperature and humidity.
Generation V
Its appearance changes with the weather. Recently, its molecules were found to be just like water.
Temperature and weather affect its cellular structure, so this Pokémon changes form according to the weather.
Generation VI
This Pokémon can change its cells, taking different forms based on the temperature and humidity.
It has the ability to change its form into the sun, the rain, or a snow cloud, depending on the weather.
Castform’s appearance changes with the weather. This Pokémon gained the ability to use the vast power of nature to protect its tiny body.
Castform borrows the power of nature to transform itself into the guises of the sun, rain, and snow-clouds. This Pokémon’s feelings change with the weather.
Generation VII
It changes its form depending on the weather. Changes in the temperature or humidity appear to affect its cellular structure.
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.
Its form changes on its own, due to its cells’ sensitive reactions to temperature and humidity.
Its form changes depending on the weather. The rougher conditions get, the rougher Castform’s disposition!
Castform-sunny Name Origin & Design Inspiration
The name Castform derives from the English words 'cast' and 'form,' directly referencing the Pokémon's ability to cast itself into different forms based on weather conditions. In Japanese, it is known as Powalun, a name constructed from 'powā' (power) and 'run,' suggesting the concept of running or flowing power. The Sunny Form's design transforms Castform into a golden, sun-like orb with a circular shape, replacing the standard gray cloud aesthetic with warm, radiant coloring that visually communicates its Fire-type status. This form specifically evokes imagery of the sun itself—round, glowing, and radiating energy—making the transformation intuitive and immediately recognizable to players. The design emphasizes compactness and simplicity, maintaining the large spherical head that characterizes all Castform forms while shifting the color palette from gray to brilliant yellow and orange hues. The artistic direction reflects the Pokémon's artificial nature; unlike natural Fire-types that possess organic warmth or biological flame generation, Castform's Sunny Form appears more like a condensed ball of solar energy temporarily taking physical form rather than a traditionally biological creature.
Learnable Moves
Castform-sunny can learn 70 moves:
Move | Type | Cat. | Power | Acc. | PP |
|---|---|---|---|---|---|
| amnesia | psychic | Status | — | — | 20 |
| attract | normal | Status | — | 100 | 15 |
| avalanche | ice | Physical | 60 | 100 | 10 |
| blizzard | ice | Special | 110 | 70 | 5 |
| body slam | normal | Physical | 85 | 100 | 15 |
| captivate | normal | Status | — | 100 | 20 |
| clear smog | poison | Special | 50 | — | 15 |
| confide | normal | Status | — | — | 20 |
| cosmic power | psychic | Status | — | — | 20 |
| defense curl | normal | Status | — | — | 40 |
| defog | flying | Status | — | — | 15 |
| disable | normal | Status | — | 100 | 20 |
| double team | normal | Status | — | — | 15 |
| double edge | normal | Physical | 120 | 100 | 15 |
| ember | fire | Special | 40 | 100 | 25 |
| endure | normal | Status | — | — | 10 |
| energy ball | grass | Special | 90 | 100 | 10 |
| facade | normal | Physical | 70 | 100 | 20 |
| fire blast | fire | Special | 110 | 85 | 5 |
| flamethrower | fire | Special | 90 | 100 | 15 |
| flash | normal | Status | — | 100 | 20 |
| frustration | normal | Physical | — | 100 | 20 |
| future sight | psychic | Special | 120 | 100 | 10 |
| guard swap | psychic | Status | — | — | 10 |
| hail | ice | Status | — | — | 10 |
| headbutt | normal | Physical | 70 | 100 | 15 |
| hex | ghost | Special | 65 | 100 | 10 |
| hidden power | normal | Special | 60 | 100 | 15 |
| hurricane | flying | Special | 110 | 70 | 10 |
| hydro pump | water | Special | 110 | 80 | 5 |
| ice beam | ice | Special | 90 | 100 | 10 |
| icy wind | ice | Special | 55 | 95 | 15 |
| incinerate | fire | Special | 60 | 100 | 15 |
| last resort | normal | Physical | 140 | 100 | 5 |
| lucky chant | normal | Status | — | — | 30 |
| mimic | normal | Status | — | — | 10 |
| natural gift | normal | Physical | — | 100 | 15 |
| ominous wind | ghost | Special | 60 | 100 | 5 |
| powder snow | ice | Special | 40 | 100 | 25 |
| protect | normal | Status | — | — | 10 |
| psych up | normal | Status | — | — | 10 |
| rain dance | water | Status | — | — | 5 |
| reflect type | normal | Status | — | — | 15 |
| rest | psychic | Status | — | — | 5 |
| retaliate | normal | Physical | 70 | 100 | 5 |
| return | normal | Physical | — | 100 | 20 |
| round | normal | Special | 60 | 100 | 15 |
| sandstorm | rock | Status | — | — | 10 |
| scald | water | Special | 80 | 100 | 15 |
| secret power | normal | Physical | 70 | 100 | 20 |
| shadow ball | ghost | Special | 80 | 100 | 15 |
| shock wave | electric | Special | 60 | — | 20 |
| sleep talk | normal | Status | — | — | 10 |
| snore | normal | Special | 50 | 100 | 15 |
| solar beam | grass | Special | 120 | 100 | 10 |
| substitute | normal | Status | — | — | 10 |
| sunny day | fire | Status | — | — | 5 |
| swagger | normal | Status | — | 85 | 15 |
| swift | normal | Special | 60 | — | 20 |
| tackle | normal | Physical | 40 | 100 | 35 |
| tailwind | flying | Status | — | — | 15 |
| thief | dark | Physical | 60 | 100 | 25 |
| thunder | electric | Special | 110 | 70 | 10 |
| thunder wave | electric | Status | — | 90 | 20 |
| thunderbolt | electric | Special | 90 | 100 | 15 |
| toxic | poison | Status | — | 90 | 10 |
| water gun | water | Special | 40 | 100 | 25 |
| water pulse | water | Special | 60 | 100 | 20 |
| weather ball | normal | Special | 50 | 100 | 10 |
| work up | normal | Status | — | — | 30 |
Castform-sunny Competitive Battle Guide
The Sunny Form of Castform occupies a challenging niche in competitive Pokémon battling, offering utility and weather-dependent synergies rather than raw statistical power. With perfectly balanced base stats of 70 across all categories, Castform's Sunny Form lacks the specialized stat distributions that make many competitive threats formidable, though this universal mediocrity does allow for flexible EV training depending on the player's strategic intent. In competitive contexts, Castform functions best as a weather-dependent supporter rather than a primary attacker, leveraging its Fire-type classification to gain advantages during harsh sunlight weather conditions. The Forecast ability is Castform's signature strength, automatically converting it to Fire-type in sunny conditions without requiring dedicated move slots or ability activation, effectively providing free type advantages and movepool access. Castform's movepool includes moves like Sunny Day, Weather Ball, and various Fire-type attacks that gain enhanced power when sun is active, allowing for weather-based strategies that complement sun-dependent teams featuring Pokémon like Groudon, Chlorophyll users, or other weather synergy specialists. However, Castform's low overall stats and lack of standout individual values mean it often struggles against more specialized competitors, typically finding success only in casual formats or specialized weather-focused team compositions where its form transformation becomes a genuine tactical advantage rather than a gimmick.
Commonly Asked Questions About Castform-sunny
What type is Castform-sunny?
Castform-sunny is a fire type Pokemon.
What does Castform-sunny evolve into?
Castform-sunny does not evolve.
What are Castform-sunny's weaknesses?
Castform-sunny is weak to ground, rock and water type moves.
Castform-sunny Cultural Impact & Franchise History
Castform has achieved modest but memorable cultural presence within the Pokémon franchise, particularly through its innovative weather-dependent mechanics that challenged conventional thinking about Pokémon design during Generation III. The Weather Pokémon appeared prominently in the animated series, with multiple significant encounters showcasing its unique form-changing ability to younger audiences discovering the franchise through television. Its Sunny Form has been featured in various Pokémon trading card game releases, though these cards typically receive modest competitive attention compared to powerhouse species. Castform represents an important design philosophy that influenced subsequent Pokémon generations, particularly the introduction of other form-changing Pokémon like Cherrim, Eiscue, and Pecharunt that similarly transform based on environmental or battle conditions. The species demonstrates the franchise's willingness to prioritize creative, mechanically interesting designs over raw statistical dominance, earning respect among dedicated fans who appreciate ecological authenticity and environmental storytelling. Castform's appearance in multiple Pokémon games, remakes, and spin-offs has maintained its relevance across the franchise's evolution, ensuring that trainers continue discovering this unique Pokémon and experimenting with weather-based team compositions across multiple generations and gaming platforms.
Where to Find Castform-sunny in Every Pokémon Game
Castform's availability varies significantly across Pokémon generations and specific game titles, though the species remains reasonably obtainable for dedicated trainers willing to seek it out. In the original Generation III games (Pokémon Ruby, Sapphire, and Emerald), Castform appears in the Weather Institute on Route 119, making it accessible during normal progression for players exploring this iconic location. Subsequent remakes including Pokémon Omega Ruby and Alpha Sapphire maintained Castform's presence in the Hoenn region, ensuring its availability to modern trainers experiencing updated versions of these classic games. The species has appeared in numerous other regional Pokédex entries across generations, including appearances in Black 2/White 2, Sun/Moon, and Ultra Sun/Ultra Moon, though specific catch rates and encounter methods vary considerably depending on the particular title. Castform carries a base capture rate of 45, making it moderately difficult to catch compared to common Pokémon but far easier than legendary species, requiring standard Poké Balls and basic capture techniques for most trainers. The species' presence in Pokémon HOME and the Pokédex across multiple games ensures continued availability for trainers seeking to complete their collections, though obtaining a Sunny Form specifically requires encountering or battling Castform during sunny weather conditions within their respective games, adding an additional layer of availability complexity for completionists.