101Leafy researched the games.
Spark Plug

A new blade-based Lance with a Great Thunderbug's spirit. Capable of high-volt shots.
| Class | Lance |
|---|---|
| Rarity | 9 |
| Attack | 506 |
| Thunder | 250 |
| Slots | 2 |
| Price | 90,000z |
Upgrades
| Upgraded from | Babel Spear |
|---|---|
| Upgrades into | ThunderbugShockLance |
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
Eltalite Ore ×15, HrdPuGypcerosWng ×8, Thunderbug Juice ×10, Thunderbug ×20