101Leafy researched the games.
Dual Battleaxe+

Dual Axes based off of the poisonous Sword. Simple, yet highly-effective weapons.
| Class | Dual Blades |
|---|---|
| Rarity | 9 |
| Attack | 322 |
| Poison | 140 |
| Slots | 1 |
| Price | 90,000z |
Upgrades
| Upgraded from | Dual Battleaxe |
|---|---|
| Upgrades into | Final Battleaxe |
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.