101Leafy researched the games.
Gradios Ultimus

With the Fire attribute of fire wyverns in tow, one attack is sure to be deadly.
| Class | Dual Blades |
|---|---|
| Rarity | 7 |
| Attack | 252 |
| Fire | 350 |
| Slots | 1 |
| Table price | 75,000z |
Upgrades
| Upgraded from | Hi Twin Flames |
|---|---|
| Upgrades into | Corpse Blades |
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.