# Cloyster #20/112 — FireRed & LeafGreen

## Summary

Cloyster has long been a Gen I fan favorite, remembered as a defensive Water type that hit far harder than its shell suggested, and FireRed & LeafGreen sold on exactly that Kanto nostalgia. As a mid-tier Rare, it was a solid pull rather than a chase, with Aya Kusube's name adding collector interest. The modelled guide sits at $2.85, flat over 30 days on 4 copies traded, with 164 days of inventory on the board; a CGC 10 brings $19, 6.8 times raw, but PSA does not split this card’s population by finish, so no gem rate can be read for it.

## Identity

| Field | Value |
| --- | --- |
| Set | FireRed & LeafGreen |
| Number | 20/112 |
| Rarity | Rare |
| Era | EX |
| Illustrator | Aya Kusube |
| Release date | 2004-09-01 |
| Image | Unavailable |

## Card details

| Field | Value |
| --- | --- |
| Card type | POKEMON |
| Stage | Stage1 |
| Evolves from | Shellder |
| HP | 70 |
| Types | Water |
| Ability: Exoskeleton | Any damage done to Cloyster by attacks is reduced by 20 (after applying Weakness and Resistance). |
| Attack: Double Bubble | cost Colorless/Colorless — damage 10x — Flip 2 coins. This attack does 10 damage times the number of heads. If either of the coins is heads, the Defending Pokémon is now Paralyzed. |
| Attack: Shell Attack | cost Water/Colorless/Colorless — damage 50 |
| Weakness | Lightning ×2 |
| Retreat | 1 |
| Legal | Standard no · Expanded no |
| Pokédex entry | [Cloyster #091](https://cardboardalpha.com/pokemon/pokedex/cloyster) |
| Finishes | Normal, Reverse Holo |
| Languages | EN |

## Current stats

- Headline price: **$2.85** (ITEM_MEDIAN; modelled guide price) — as of 2026-11-04
- Headline basis: MODELLED_GUIDE — The venue’s published daily market guide, which the venue itself declares MODELLED. Nothing is confirmed to have traded at it, no copy is listed at it, and it is not our estimate — it is theirs.
- 24h change: n/a · 7d change: n/a — as of 2026-11-04
- Floor delivered ask: $3.49 — as of 2026-11-04T06:35:00.219Z
- Quant score: 22/100, regime ILLIQUID_UNKNOWN — as of 2026-11-04T06:35:00.219Z — 4 of 11 inputs · 38% weight · -31% confidence

## Provenance

- Catalog — observed 2004-09-01T00:00:00Z, confidence 98%
- Live ask — observed 2026-10-20T06:25:54.086Z, confidence 90%
- Price statistic — observed 2026-10-20T06:25:52.446Z, confidence 90%
- Confirmed sale — observed 2026-10-16T05:59:29.970Z, confidence 85%
- Guide price (modelled) — observed 2026-11-04T06:31:54.041Z, confidence 75%
- Inventory count — observed 2026-10-20T06:25:52.446Z, confidence 70%
- Population census — observed 2026-09-09T18:37:53.359Z, confidence 60%

## Links

- [View on Cardboard Alpha](https://cardboardalpha.com/pokemon/firered-leafgreen/cloyster-20)
- [JSON snapshot](https://cardboardalpha.com/api/terminal/raw~tcgdex%3Aex6-20%3AEN%3ANORMAL~NM)