# Gastrodon #29/114 — Steam Siege

## Summary

Gastrodon carries a quiet cult following from Sinnoh, where the East Sea form and its sluggish charm won over fans who like their Water types odd rather than flashy. A mid-tier Rare in Steam Siege, it was a solid pull with a status-leaning kit, and Aya Kusube's name adds a small draw. The modelled guide sits at $0.64, up 7% over 30 days on 43 copies traded, with 105 days of inventory on the board; a PSA 10 guides at $34, 54 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 | Steam Siege |
| Number | 29/114 |
| Rarity | Rare |
| Era | XY |
| Illustrator | Aya Kusube |
| Release date | 2016-08-03 |
| Image | Unavailable |

## Card details

| Field | Value |
| --- | --- |
| Card type | POKEMON |
| Stage | Stage1 |
| Evolves from | Shellos |
| HP | 110 |
| Types | Water |
| Attack: Sticky Shot | cost Water — damage 20 — During your opponent's next turn, the Defending Pokémon's attacks cost Colorless more, and its Retreat Cost is Colorless more. |
| Attack: Water Pulse | cost Water/Water/Water — damage 60 — Your opponent's Active Pokémon is now Asleep. |
| Weakness | Grass ×2 |
| Retreat | 2 |
| Legal | Standard no · Expanded yes |
| Pokédex entry | [Gastrodon #423](https://cardboardalpha.com/pokemon/pokedex/gastrodon) |
| Finishes | Normal, Reverse Holo |
| Languages | EN |

## Current stats

- Headline price: **$0.64** (ITEM_MEDIAN; modelled guide price) — as of 2026-11-03
- 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 2026-11-03
- Floor delivered ask: $1.93 — as of 2026-11-03T10:34:23.072Z
- Quant score: 82/100, regime FLOOR_FORMING — as of 2026-11-03T10:34:23.072Z — 3 of 11 inputs · 29% weight · -35% confidence

## Provenance

- Catalog — observed 2016-08-03T00:00:00Z, confidence 98%
- Live ask — observed 2026-10-22T18:36:42.466Z, confidence 90%
- Price statistic — observed 2026-10-21T01:03:15.511Z, confidence 90%
- Confirmed sale — observed 2026-10-20T22:18:16.297Z, confidence 85%
- Guide price (modelled) — observed 2026-11-03T06:34:05.762Z, confidence 75%
- Inventory count — observed 2026-10-21T01:03:15.510Z, confidence 70%
- Population census — observed 2026-09-08T16:40:04.521Z, confidence 60%

## Links

- [View on Cardboard Alpha](https://cardboardalpha.com/pokemon/steam-siege/gastrodon-29)
- [JSON snapshot](https://cardboardalpha.com/api/terminal/raw~tcgdex%3Axy11-29%3AEN%3ANORMAL~NM)