101Leafy researched the games.
Shell Hammer

Uses poison Basarios Shell. Occasionally poisons its monster foes.
| Class | Hammer |
|---|---|
| Rarity | 4 |
| Attack | 728 |
| Poison | 120 |
| Defense | +8 |
| Slots | 2 |
| Price | 4,250z |
Upgrades
| Upgraded from | Spiked Hammer+ |
|---|---|
| Upgrades into | Graviton Hammer |
Can also be made new at the smithy.
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 722.
Materials
Basarios Shell ×8, Machalite Ore ×5, Ioprey Fang ×18, Hercudrome ×3