101Leafy researched the games.
Giaprey Balloon

Based on a Giaprey head. Inflating its windpipe mimics a Giaprey's call.
| Class | Hunting Horn |
|---|---|
| Rarity | 2 |
| Attack | 416 |
| Ice | 100 |
| Slots | 0 |
| Price | 990z |
Upgrades
| Upgraded from | Bone Club |
|---|---|
| Upgrades into | Giaprey Balloon+ |
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 736.
Materials
Giaprey Hide ×4, Brute Bone ×3, Anteka Antlers ×1, Iron Ore ×5
Plus Class Tcket ×1, Giaprey Scale ×1