101Leafy researched the games.
Osteon Pick

Made of high quality monster spine, it is as rough and powerful as it looks.
| Class | Sword |
|---|---|
| Rarity | 6 |
| Attack | 280 |
| Slots | 0 |
| Price | 25,000z |
Upgrades
| Upgraded from | Studded Club |
|---|---|
| Upgrades into | Osteon Pick+, Feather Knife |
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 702.
Materials
Hrd Monster Bone ×4, Lg Monster Bone ×12, Brute Bone ×30
Plus Class Tcket ×1, Hrd Monster Bone ×1