101Leafy researched the games.
Dual Dragon Ultimus

The Dragon element infused in these Dual Blades hits enemies from both sides.
| Class | Dual Blades |
|---|---|
| Rarity | 7 |
| Attack | 266 |
| Dragon | 270 |
| Slots | 1 |
| Table price | 90,000z |
Upgrades
| Upgraded from | Double Dragon |
|---|---|
| Upgrades into | Ultimus Heaven&Earth |
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.