101Leafy researched the games.
Twin Dagger

Dual Iron Knives. No Defense, but increases your number of attacks.
| Class | Dual Blades |
|---|---|
| Rarity | 1 |
| Attack | 112 |
| Slots | 0 |
| Price | 680z |
Upgrades
| Upgraded from | Giaprey Claws |
|---|---|
| Upgrades into | Twin Dagger+ |
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 712.
Materials
Machalite Ore ×2, Iron Ore ×5, Earth Crystal ×2
Hard Ticket ×1, Disk Stone ×1