101Leafy researched the games.
Sea God Leviathan

An extension of a Piscine. Its shells have tsunami-like power. Shelling Lv3
A gunlance made by soaking Plesioth fins in a special solution and drying them in the sun again and again, until they reached a hardness said to "break through a tidal wave". It combines an excellent design that lets it attack by swinging as well as thrusting with highly accurate shelling.
Our translation of 復刻 ハンター大全 (KADOKAWA / Enterbrain, 2014), page 166.
| Class | Gunlance |
|---|---|
| Rarity | 9 |
| Attack | 506 |
| Water | 370 |
| Slots | 0 |
| Shelling | Long Type Level 3 |
| Table price | 90,000z |
Upgrades
| Upgraded from | Sea King Gunlance |
|---|---|
| Upgrades into | Sea Abyss |
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 758.