101Leafy researched the games.
Wyvern Agito

A traditional Bone Sword made from an abundance of high quality materials.
| Class | Great Sword |
|---|---|
| Rarity | 6 |
| Attack | 1008 |
| Slots | 0 |
| Table price | 35,000z |
Upgrades
| Upgraded from | Agito |
|---|---|
| Upgrades into | True Dragon's Jaw, Demon Rod |
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 680.