Encounter locations
Kanto · 17 encounter records
| Location | Method | Level |
|---|---|---|
| Cinnabar Island | Good Rod | 5–15 |
| Cinnabar Island | Super Rod | 15–35 |
| Five Island | Super Rod | 15–25 |
| Four Island Icefall Cave Back | Super Rod | 15–25 |
| One Island | Super Rod | 15–25 |
| Pallet Town | Good Rod | 5–15 |
| Pallet Town | Super Rod | 15–35 |
| Route 20 | Good Rod | 5–15 |
| Route 20 | Super Rod | 15–35 |
| Route 21 North | Good Rod | 5–15 |
| Route 21 North | Super Rod | 15–35 |
| Route 21 South | Good Rod | 5–15 |
| Route 21 South | Super Rod | 15–35 |
| S.S. Anne Exterior | Good Rod | 5–15 |
| S.S. Anne Exterior | Super Rod | 15–35 |
| Vermilion City | Good Rod | 5–15 |
| Vermilion City | Super Rod | 15–35 |
Johto · 41 encounter records
| Location | Method | Level |
|---|---|---|
| Cinnabar Island | Good RodDay | 20 |
| Cinnabar Island | Good RodNight | 20 |
| Cinnabar Island | Super RodDay | 40 |
| Cinnabar Island | Super RodNight | 40 |
| New Bark | Good RodDay | 20 |
| New Bark | Good RodNight | 20 |
| New Bark | Super RodDay | 40 |
| New Bark | Super RodNight | 40 |
| Pallet | Good RodDay | 20 |
| Pallet | Good RodNight | 20 |
| Pallet | Super RodDay | 40 |
| Pallet | Super RodNight | 40 |
| Route 20 | Good RodDay | 20 |
| Route 20 | Good RodNight | 20 |
| Route 20 | Super RodDay | 40 |
| Route 20 | Super RodNight | 40 |
| Route 21 | Good RodDay | 20 |
| Route 21 | Good RodNight | 20 |
| Route 21 | Super RodDay | 40 |
| Route 21 | Super RodNight | 40 |
| Route 26 | Good RodDay | 20 |
| Route 26 | Good RodNight | 20 |
| Route 26 | Super RodDay | 40 |
| Route 26 | Super RodNight | 40 |
| Route 27 | Good RodDay | 20 |
| Route 27 | Good RodNight | 20 |
| Route 27 | Super RodDay | 40 |
| Route 27 | Super RodNight | 40 |
| Route 41 | Good RodDay | 20 |
| Route 41 | Good RodNight | 20 |
| Route 41 | Super RodDay | 40 |
| Route 41 | Super RodNight | 40 |
| Route 47 | Good RodDay | 20 |
| Route 47 | Good RodNight | 20 |
| Route 47 | Super RodDay | 40 |
| Route 47 | Super RodNight | 40 |
| Slowpoke Well | Overworld swarmOnly while this swarm is active | — |
| Vermilion | Good RodDay | 20 |
| Vermilion | Good RodNight | 20 |
| Vermilion | Super RodDay | 40 |
| Vermilion | Super RodNight | 40 |
This Pokémon is eligible for Mirage Rifts. Each opening rolls its own pool, so check active portals on the Town Map.
Check the Town Map to see which swarms are active.
This guide covers documented encounter tables and selected story events. Other scripted gifts or events may also award this Pokémon.
Natures
Randomly generated Pokémon can have any of the 25 natures. Twenty raise one stat by 10% and lower another by 10%. Five are neutral. HP stays the same.
View all 25 natures and stat effects
| Nature | Raises (+10%) | Lowers (−10%) |
|---|---|---|
| Hardy | — | — |
| Lonely | Attack | Defense |
| Brave | Attack | Speed |
| Adamant | Attack | Special Attack |
| Naughty | Attack | Special Defense |
| Bold | Defense | Attack |
| Docile | — | — |
| Relaxed | Defense | Speed |
| Impish | Defense | Special Attack |
| Lax | Defense | Special Defense |
| Timid | Speed | Attack |
| Hasty | Speed | Defense |
| Serious | — | — |
| Jolly | Speed | Special Attack |
| Naive | Speed | Special Defense |
| Modest | Special Attack | Attack |
| Mild | Special Attack | Defense |
| Quiet | Special Attack | Speed |
| Bashful | — | — |
| Rash | Special Attack | Special Defense |
| Calm | Special Defense | Attack |
| Gentle | Special Defense | Defense |
| Sassy | Special Defense | Speed |
| Careful | Special Defense | Special Attack |
| Quirky | — | — |
Stats and abilities
- HP
- 30
- Attack
- 65
- Defense
- 100
- Sp. Attack
- 45
- Sp. Defense
- 25
- Speed
- 40
Abilities · Shell Armor / Skill Link
Hidden ability · Overcoat
Size · 0.3 m · 4 kg
Evolution and forms
- Into Cloyster · Use Water Stone
Level-up moves
View level-up moves for Shellder
| Level | Move |
|---|---|
| 1 | Tackle |
| 1 | Water Gun |
| 4 | Withdraw |
| 8 | Ice Shard |
| 12 | Leer |
| 16 | Whirlpool |
| 20 | Supersonic |
| 24 | Aurora Beam |
| 28 | Protect |
| 32 | Razor Shell |
| 36 | Iron Defense |
| 40 | Ice Beam |
| 44 | Shell Smash |
| 48 | Hydro Pump |