101Leafy researched the games.
Bone Javelin

Lightweight Bone Spear. Easy to craft and easier to use, giving it many fans.
| Class | Lance |
|---|---|
| Rarity | 2 |
| Attack | 230 |
| Slots | 0 |
| Price | 1,400z |
Upgrades
| Upgraded from | Iron Lance+ |
|---|---|
| Upgrades into | Spiked Spear |
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 746.