101Leafy researched the games.
Aqua Spear

Piscine adds elemental effect. Shoots pressurized water from its cutting edge.
| Class | Lance |
|---|---|
| Rarity | 6 |
| Attack | 368 |
| Water | 350 |
| Slots | 0 |
| Price | 40,000z |
Upgrades
| Upgraded from | Knight Lance |
|---|---|
| Upgrades into | Aqua Spear+ |
Can also be made new at the smithy.
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 746.
Materials
Cephalos Fin+ ×3, Plesioth Fin ×12, Plesioth Scale ×15, Carbalite Ore ×5