101Leafy researched the games.
Black Cat Stamp

Made to resemble a black cat with a devious smile. A rare, highly desired color.
| Class | Hammer |
|---|---|
| Rarity | 4 |
| Attack | 624 |
| Paralysis | 240 |
| Slots | 0 |
| Price | 3,650z |
Upgrades
| Upgraded from | White Cat Stamp |
|---|---|
| Upgrades into | Black Cat Hammer, Gold Cat Hammer |
Upgrade tree from モンスターハンターポータブル 2nd G 公式ガイドブック (Enterbrain, 2008), page 726.