101Leafy researched the games.
Plesioth Wave Blade

High-maintenance topquality piece, many times stronger than a water beam.
| Class | Great Sword |
|---|---|
| Rarity | 9 |
| Attack | 1296 |
| Water | 470 |
| Slots | 1 |
| Price | 110,000z |
Upgrades
| Upgraded from | Plesioth Wave Sword |
|---|
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 682.