Species guide · Ages 10+ · July 2026
Castform
Say it: CA-stf-orm
Kids summary (simpler)Tap to expand
Castform is the Weather Pokémon — normally Normal, but it can change to Fire, Water, or Ice forms with the weather. In Pokémon GO each form has its own typing and Weather Ball. Catch Castform from the wild, eggs, or weather-boosted events.
Say it: CA-stf-orm
Castform (#351) is a weather-form Pokémon in Pokémon GO. Base Castform is Normal; Sunny, Rainy, and Snowy forms are Fire, Water, and Ice. Trainers use the matching Weather Ball form for niche PvP and budget attackers. Our Game Master snapshot may show one weather form.
Type-colored placeholder — not official Pokémon artwork (see IP notice below).
Pokédex notes
Castform is a Normal-type Pokémon in Pokémon GO. National Dex #0351. Normal types need coverage moves — check our moveset guide before spending TMs.
Where in GO: Wild spawns, eggs, Field Research, and seasonal events
Invest tip: Build the weather form you actually use: Weather Ball matching the form’s type is the whole identity. Shadow Castform follows Shadow rules. No Community Day exclusive is required.
Type matchups
- Fire moves hit Grass, Ice, Bug, and Steel hard.
When Castform is your opponent, Water, Ground, Rock hits hard.
Full type matchup guide →GO base stats
From Game Master snapshot — IVs, buddy, and power-ups change real battle stats.
- Attack
- 139
- Defense
- 139
- Stamina
- 172
Weak to
Resists
Best Pokémon to use against it
When this species is your opponent (Rocket battle, gym, raid, or PvP), these picks exploit its typings. Each list is a pool of options — not a required 12-Pokémon lobby.
Recommended
Strongest practical attackers for this matchup.
- 1. Primal Kyogre · beats Water
Waterfall + Origin Pulse — Primal lobby boost
- 2. Shadow Kyogre · beats Water
Waterfall + Origin Pulse
- 3. Mega Swampert · beats Water
Water Gun + Hydro Cannon · Elite TM
- 4. Kyogre · beats Water
Waterfall + Origin Pulse
- 5. Shadow Kingler · beats Water
Bubble + Crabhammer
- 6. Shadow Feraligatr · beats Water
Waterfall + Hydro Cannon · Elite TM
- 7. Kingler · beats Water
Bubble + Crabhammer
- 8. Swampert · beats Water
Water Gun + Hydro Cannon · Elite TM
- 9. Feraligatr · beats Water
Waterfall + Hydro Cannon · Elite TM
- 10. Samurott · beats Water
Waterfall + Hydro Cannon · Elite TM
- 11. Gyarados · beats Water
Waterfall + Aqua Tail
- 12. Empoleon · beats Water
Waterfall + Hydro Cannon · Elite TM
Budget
Solid alternatives when you cannot build the Recommended picks.
- 1. Kingler · beats Water
Bubble + Crabhammer
- 2. Gyarados · beats Water
Waterfall + Aqua Tail
- 3. Vaporeon · beats Water
Water Gun + Aqua Tail
- 4. Feraligatr · beats Water
Waterfall + Hydro Cannon · Elite TM
- 5. Swampert · beats Water
Water Gun + Hydro Cannon · Elite TM
- 6. Clawitzer · beats Water
Water Gun + Crabhammer
- 7. Floatzel · beats Water
Water Gun + Aqua Jet
- 8. Seismitoad · beats Water
Mud Shot + Hydro Pump
- 9. Carracosta · beats Water
Water Gun + Hydro Pump
- 10. Blastoise · beats Water
Water Gun + Hydro Cannon · Elite TM
- 11. Wailord · beats Water
Water Gun + Surf
- 12. Golisopod · beats Water
Waterfall + Aqua Jet
Recommended moves
Game Master may list only one Castform weather form. Rainy uses Water Weather Ball; Snowy uses Ice Weather Ball; base uses Normal kits — confirm the form before TMing.
Fast
- Tackle · Standard
Normal / shared fast
- Ember · Standard
Sunny form Fire STAB
Charged
- Weather Ball (Fire) · Standard
Sunny form nuke
- Fire Blast · Standard
Sunny form backup
- Solar Beam · Standard
Grass coverage
Moves in GO
Always-available Game Master learnset (regular TMs). Community Day / Elite TM moves appear above when we have curated notes for this species.
Fast
- ember
- tackle
Charged
- fire blast
- solar beam
- weather ball fire
PvP league ranks (family snapshot)
- Great League · rank #33 of 954 · CP 1492
Ember + Solar Beam
- Ultra League · rank #432 of 747 · CP 1845
Ember + Solar Beam
- Master League · rank #451 of 1023 · CP 1845
Ember + Solar Beam
In your Collect
Name match only (text). Cards you have saved in Card Nexus Collect — not official art.
Sign in to see holdings, or open Collect.
Open Collect →Raid and PvP advice uses our Game Master snapshot (updated July 2026).
In the Competitive Guide
- Ch. 20: Lucky Pokémon & Family Trades
When lucky status matters for trades and Stardust savings.
- Ch. 21: Best Friends & Lucky Friends
Friendship steps for raid bonuses and lucky trades.