101Leafy researched the games.
Giadrome Balloon

Based on a Giaprey head. Inflating its windpipe mimics a Giaprey's call.
| Class | Hunting Horn |
|---|---|
| Rarity | 6 |
| Attack | 1040 |
| Ice | 180 |
| Slots | 0 |
| Price | 40,000z |
Upgrades
| Upgraded from | Giaprey Balloon+ |
|---|
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.