Cloyster
#91 in the Kanto Pokédex • Bivalve Pokémon
Cloyster in the National Pokédex
Pokédex entries
FireRed
Its shell is extremely hard. It cannot be shattered, even with a bomb. The shell opens only when it is attacking.
LeafGreen
When attacked, it launches its horns in quick volleys. Its innards have never been seen.
Pokémon details
Types
Category
Ability
Height
Weight
National Pokédex
Kanto Pokédex
Cloyster in Other Games
National Dex pageMin
Max
HP
50
210
304
Attack
95
175
317
Defense
180
328
504
Sp. Atk
85
157
295
Sp. Def
45
85
207
Speed
70
130
262
Total
525
Ranges are for Level 100. Max assumes a beneficial nature, 252 EVs, and 31 IVs; min assumes a hindering nature, 0 EVs, and 0 IVs.
Game availability
Available within the FireRed/LeafGreen pair. Depending on the species, acquisition can require the other version, the postgame, evolution, breeding, or an event ticket. Original GBA event tickets required historical distributions; Switch ticket access differs.
| EV yield | 2 Def |
|---|---|
| Catch rate | 60 |
| Base Exp. | 203 |
| Egg groups | |
|---|---|
| Gender | 50% male 50% female |
| Egg cycles | 20 (5,375 steps) |
| Pokémon | Requires | Evolution |
|---|---|---|
 Shellder #90 |  Cloyster #91 |
Evolution
FireRed exclusiveEvolve Shellder with a Water Stone. Shellder is exclusive to FireRed, so in LeafGreen you will need to trade one over.
| Class | ||||||
|---|---|---|---|---|---|---|
| Start | Supersonic |  |  | - | 55 | 20 |
| Start | Aurora Beam | |  | 65 | 100 | 20 |
| Start | Withdraw | | | - | - | 40 |
| Start | Protect | | | - | - | 10 |
| 36 | Spikes |  | | - | - | 20 |
| 43 | Spike Cannon | |  | 20 | 100 | 15 |
| Class | ||||||
|---|---|---|---|---|---|---|
| TM03 | Water Pulse | | | 60 | 100 | 20 |
| TM06 | Toxic |  | | - | 85 | 10 |
| TM07 | Hail | | | - | - | 10 |
| TM10 | Hidden Power | | | - | 100 | 15 |
| TM13 | Ice Beam | | | 95 | 100 | 10 |
| TM14 | Blizzard | | | 120 | 70 | 5 |
| TM15 | Hyper Beam | | | 150 | 90 | 5 |
| TM17 | Protect | | | - | - | 10 |
| TM18 | Rain Dance | | | - | - | 5 |
| TM21 | Frustration | | | - | 100 | 20 |
| TM27 | Return | | | - | 100 | 20 |
| TM32 | Double Team | | | - | - | 15 |
| TM41 | Torment |  | | - | 100 | 15 |
| TM42 | Facade | | | 70 | 100 | 20 |
| TM43 | Secret Power | | | 70 | 100 | 20 |
| TM44 | Rest |  | | - | - | 10 |
| TM45 | Attract | | | - | 100 | 15 |
| HM03 | Surf | | | 95 | 100 | 15 |
| HM08 | Dive | | | 60 | 100 | 10 |
| Class | |||||
|---|---|---|---|---|---|
| Double-Edge | | | 120 | 100 | 15 |
| Explosion | | | 250 | 100 | 5 |
| Mimic | | | - | - | 10 |
| Substitute | | | - | - | 10 |
Shell Armor
Blocks critical hits.
Protects against critical hits.
