castform-rainy #10014
Type Matchups
Weak to (2x damage):
Resistant to (½x damage):
castform-rainy
Generation III · #10014 — Weather Pokémon
Castform's Rainy Form represents one of the most fascinating examples of weather-dependent transformation in the Pokémon world. Introduced in Generation III, this Water-type variant of the Weather Pokémon (#351) emerges whenever rain falls during battle or in affected areas. Unlike its Normal Form counterpart or its Sunny and Snowy transformations, the Rainy Form showcases Castform's remarkable ability to harness the power of precipitation, borrowing nature's hydrous forces to fundamentally alter its molecular composition and battle capabilities. This form maintains the same base stat total of 420 points as all other Castform variations, with perfectly balanced distributions across all six stats—70 HP, 70 Attack, 70 Defense, 70 Special Attack, 70 Special Defense, and 70 Speed—making it equally proficient in any battle role depending on the moveset employed. The transformation itself is governed by Castform's signature Forecast ability, an automatic weather-sensing mechanism that changes not only the Pokémon's appearance but also its typing to match environmental conditions.
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-rainy Biology & Physical Characteristics
Castform's Rainy Form represents a remarkable example of adaptive cellular biology within the Pokémon species. According to scientific findings documented in Pokédex entries from Diamond and Pearl, Castform's molecules are chemically identical to water itself, allowing its cellular structure to undergo dramatic transformations in response to temperature and humidity fluctuations. When rain falls, this Water-type composition becomes dominant, and the Pokémon's body restructures to optimize itself for aquatic environments and water-based combat. The transformation is not merely cosmetic but represents a fundamental shift in the Pokémon's physical and chemical properties. This cellular plasticity, while extraordinary, exists not through the Pokémon's conscious will but as an autonomous biological response to environmental stimuli. The Rainy Form's appearance becomes distinctly cloud-like with water-saturated characteristics, its body taking on properties that would theoretically allow it to blend with rainfall and precipitation patterns. This biological adaptation demonstrates how Castform evolved to survive in harsh natural conditions by essentially becoming one with the weather itself.
Pokedex Numbers
Training
Breeding
Castform-rainy Breeding, Gender Ratio & Egg Groups
Castform exhibits a perfectly balanced gender ratio, with approximately 50% of individuals being male and 50% being female, allowing for straightforward breeding dynamics regardless of which form a trainer encounters. The species belongs to the Fairy and Amorphous egg groups, a somewhat unusual combination that reflects Castform's unique nature as an artificial Pokémon with fluid, indeterminate biology. The Amorphous classification particularly suits Castform, as members of this group typically possess malleable bodies without rigid structures—perfectly descriptive of a Pokémon whose cellular composition mirrors water molecules and undergoes constant transformation. When breeding Castform, trainers can expect eggs to hatch after approximately 25 cycles, equivalent to 6,169 to 6,425 steps of travel, placing it in the moderate hatching timeframe. Newly hatched Castform emerge in their Normal Form regardless of the current weather conditions, gradually developing their Forecast ability as they mature and gain experience. The breeding mechanics remain consistent across all Castform forms, as form itself is not heritable but rather a temporary manifestation tied to active weather. Base happiness for Castform stands at 70, indicating moderate sociability and reasonable bonding potential with trainers, though individual personality may vary. The species' balanced gender ratio and dual egg group membership make it accessible and desirable for competitive breeding programs, though its lack of evolutionary stages means breeders cannot influence stat distributions through evolutionary lineage manipulation.
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-rainy Evolution, Mega Evolution & Special Forms
Castform occupies a unique position in the Pokémon evolutionary hierarchy as a Pokémon that does not evolve from or into any other species, yet undergoes transformations more dramatic than many traditional evolutions. Rather than progressing through an evolutionary chain, Castform instead cycles through distinct forms—Normal, Sunny, Rainy, and Snowy—based entirely on weather conditions in battle. The Rainy Form should not be confused with a true evolution; instead, it represents one facet of Castform's singular life stage, accessible whenever rain conditions manifest during combat encounters. This form-changing mechanism, governed by the Forecast ability, makes Castform fundamentally different from other Pokémon species and has inspired numerous comparative studies among Pokémon researchers. The transformation is instantaneous and automatic, requiring no special items, experience levels, or trainer intervention beyond simply encountering rain. In this regard, Castform represents nature's answer to evolution—a Pokémon that achieves behavioral and strategic versatility not through traditional means but through environmental synchronization. The absence of Mega Evolution further emphasizes Castform's design philosophy as a Pokémon whose greatest power lies in its adaptive nature rather than in amplified combat forms, making it a singular creature that embodies the philosophy of coexistence with natural forces.
Where to Find
Location data not available for this Pokémon in the database.
Castform-rainy Behaviour and Natural Habitat
Castform's behavior undergoes subtle but meaningful changes when it assumes its Rainy Form, reflecting the Pokédex entry noting that this Pokémon's feelings change with the weather. While in rainy conditions, Castform becomes more attuned to water-type behaviors and displays increased confidence in wet environments where its Water-type typing grants advantageous type matchups. The transformation appears to trigger not just physical changes but also psychological shifts, as if the Pokémon's entire disposition becomes aligned with the rainfall surrounding it. Castform naturally gravitates toward regions experiencing precipitation, where its Rainy Form becomes optimal for both survival and engagement with other Pokémon. The species demonstrates a natural affinity for meteorological phenomena, and trainers have observed that Castform in Rainy Form exhibits increased activity levels and more aggressive territorial behavior compared to its Normal Form. Habitat-wise, Castform inhabits areas prone to variable weather patterns, particularly regions with frequent rainfall such as tropical zones, monsoon regions, and temperate areas with unpredictable precipitation. The Pokémon's remarkable adaptability means it can thrive in virtually any climate, though it appears most naturally suited to regions where weather changes occur regularly and dramatically.
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-rainy Name Origin & Design Inspiration
The name Castform derives from combining 'cast' (referencing the casting or forming of its body) with 'form,' directly acknowledging the Pokémon's defining characteristic of shifting between multiple forms. The Japanese name, Powalen (ポワルン), similarly reflects this concept with 'powa' suggesting power or transformation and 'len' implying a changeable or malleable quality. In its Rainy Form specifically, Castform's design evokes imagery of rain clouds and water droplets, with its appearance becoming noticeably more fluid and aqueous compared to the solid-looking Normal Form. The form's visual design emphasizes water-related aesthetics—its coloring becomes more blue and translucent, and its body seems to glisten with moisture, reinforcing its Water-type classification. Visually, the Rainy Form maintains Castform's characteristic large spherical head and small body proportions while adding visual elements suggesting saturation and precipitation. The design philosophy reflects a deliberate commitment to visual clarity in form differentiation; whereas Sunny Form appears bright and flame-like and Snowy Form displays icy crystalline properties, the Rainy Form distinctly communicates its water affiliation through aesthetic choices that would be immediately recognizable to trainers. This thoughtful design approach ensures each form feels distinct and purposeful rather than arbitrary, with the Rainy Form successfully capturing the essence of rain and water without straying from Castform's core identity as a cloud-based creature.
Learnable Moves
Castform-rainy 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-rainy Competitive Battle Guide
In competitive Pokémon battling, Castform's Rainy Form occupies a specialized niche as a weather-dependent supporter and attacker, particularly valuable in teams built around rain-based strategies. The Rainy Form's Water typing, combined with its perfectly distributed base stats of 70 across all categories, provides excellent flexibility in competitive construction. While the base stats appear modest compared to other competitive staples, Castform's strength lies in its ability to leverage moves that become more powerful during rain conditions, such as Thunder gaining increased accuracy or moves like Swift Swim-abusing partners receiving doubled Speed. The Rainy Form gains access to Water-type STAB (Same Type Attack Bonus) moves including Hydro Pump, Aqua Jet, and Water Pulse, enabling it to function as a viable special or physical attacker depending on moveset and nature selection. Its mediocre defenses (70/70 across both categories) mean Castform requires careful team positioning and should not absorb attacks directly from stronger opponents, but its balanced offensive capabilities and access to utility moves like Weather Ball—which becomes a Water-type move in rain with base power of 100—provide consistent offensive pressure. Strategically, Castform functions best as a secondary threat in rain-focused teams alongside Pokémon with Swift Swim abilities or other weather-dependent effects. Its ability to simultaneously benefit from and contribute to team weather strategies makes it a viable pick in lower competitive tiers and casual formats, though higher-level competitive play typically favors more specialized or powerful weather-dependent Pokémon such as Kyogre or Ludicolo.
Commonly Asked Questions About Castform-rainy
What type is Castform-rainy?
Castform-rainy is a water type Pokemon.
What does Castform-rainy evolve into?
Castform-rainy does not evolve.
What are Castform-rainy's weaknesses?
Castform-rainy is weak to grass and electric type moves.
Castform-rainy Cultural Impact & Franchise History
Castform has achieved notable recognition within Pokémon culture as one of the franchise's most creative examples of form variation, inspiring discussions about alternative approaches to Pokémon design beyond traditional evolution. The Rainy Form, alongside its sibling forms, has resonated particularly with players interested in weather mechanics and environmental storytelling within games. In the anime, Castform's appearances have highlighted the Pokémon's unique relationship with natural phenomena, showcasing dramatic transformations that capture the imagination of viewers and emphasize the interconnection between Pokémon and their environments. The species has featured in merchandise, trading card game releases, and various media depictions, with the Rainy Form represented across multiple artistic interpretations that consistently emphasize its aqueous nature and weather dependency. Among competitive Pokémon communities, Castform represents a case study in how balanced base stats and specialized typing can create a viable niche strategy despite not possessing the raw power of tier-defining legendary Pokémon. Weather enthusiasts and environmental thematic deck builders particularly appreciate Castform's design philosophy, which treats weather as a character-defining element rather than a passive battle condition. The Pokémon has inspired fan art, creative writing, and theoretical discussions about what other Pokémon might benefit from similar adaptive mechanics. Its status as a non-legendary, non-mythical Pokémon with such distinctive mechanics democratizes unique gameplay experiences, allowing trainers at all levels to enjoy weather-based team building strategies. In community terminology, Castform exemplifies the archetype of the "weather gimmick Pokémon," influencing how subsequent game generations approach environmental mechanics and conditional transformations.
Where to Find Castform-rainy in Every Pokémon Game
Castform, including its Rainy Form variant, has maintained consistent availability throughout the Pokémon game series since its introduction in Generation III's Hoenn region games (Ruby, Sapphire, and Emerald). In these foundational games, Castform appears in the Weather Institute, a location thematically appropriate for a Pokémon so intrinsically linked to meteorological phenomena, with a capture rate of 45 making it moderately difficult to catch but not exceptionally rare. The species has appeared in subsequent generations across the National Pokédex, with availability varying by game version and region. In Black 2 and White 2, Castform could be encountered with Pokédex number 163, while in Omega Ruby and Alpha Sapphire it received number 147, demonstrating its consistent presence in remakes and subsequent titles. For players in later generations, Castform has been available through Pokédex entries in Sun and Moon (Alola Pokédex #181 and #220 in Ultra Sun and Ultra Moon), ensuring accessibility across multiple gaming platforms. Trading and transfer systems like Pokémon Bank and Pokémon Home have further facilitated Castform's availability to modern players, with many able to transfer caught individuals from older games into current generation titles. The Rainy Form specifically appears automatically when rain conditions occur during battles, whether through natural weather in certain locations or through weather-setting moves and abilities employed by trainers. Event distributions and special encounters have occasionally featured Castform, particularly during weather-themed distributions. Its consistent presence across generations and accessibility through standard catching mechanics rather than rare events ensures that dedicated trainers can relatively easily obtain Castform and experiment with its Rainy Form regardless of which generation they primarily play.