101Leafy researched the games.
Melting Wail+

Saw-like Dual Blades that embody the dual nature of a Gravios: fire and poison.
| Class | Dual Blades |
|---|---|
| Rarity | 7 |
| Attack | 280 |
| Defense | +8 |
| Slots | 2 |
| Price | 60,000z |
Upgrades
| Upgraded from | Melting Wail |
|---|---|
| Upgrades into | Melting Blazer |
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 714.