101Leafy researched the games.
Violet Punisher G

Crafted with the latest methods, it looks the same, but causes G-Level damage.
The Buster Crab, whose hard frame already gave it steady aim, strengthened with Violet Hermitaur materials. The even harder frame raised the power of its shots too, making it useful for firepower as well. Because it is so stiff, reloading apparently takes a knack.
Our translation of 復刻 ハンター大全 (KADOKAWA / Enterbrain, 2014), page 171.
| Class | Heavy Bowgun |
|---|---|
| Rarity | 9 |
| Attack | 396 |
| Defense | +16 |
| Slots | 1 |
| Reload | Fairly slow |
| Recoil | Medium |
| Table price | 10,000z |
Listed in the equipment tables of 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 794.
Ammo
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 794.
Materials
Commendation S ×1, PlumD.HermitrClw ×6, PlumD.HermitrShl ×8, Wyvern Skull Shl ×3