101Leafy researched the games.
GreatTigrexGunlance

Shots from this teach any target to fear the mighty Tigrex. Shelling Lv4
| Class | Gunlance |
|---|---|
| Rarity | 10 |
| Attack | 667 |
| Affinity | -30% |
| Slots | 0 |
| Price | 125,000z |
Upgrades
| Upgraded from | Tigrex Gunlance |
|---|
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 760.