101Leafy researched the games.
Plesioth
An enormous, flightless, aquatic wyvern with wings that have evolved into fins for swimming. Although superficially fish-like, they can move on land as well. They love frogs.
Monster List No. 21
Carving
Number of carvings: 3 (BradyGames, Monster Hunter Official Strategy Guide, 2004, p. 85). The guide (p. 78) splits the carves by Quest Level: early quests are levels 1 to 3, latter quests 4 to 6.
Early quests
| Item | Chance |
|---|---|
| Plesioth Fin | 10% |
| Plesioth Scale | 20% |
| Plesioth Scale | 30% |
| Plesioth Fin | 30% |
| Plesioth Scale | 8% |
| Sm Lobstershell | 2% |
Latter quests
| Item | Chance |
|---|---|
| Plesioth Fin | 5% |
| Plesioth Scale | 5% |
| Plesioth Scale | 40% |
| Plesioth Fin | 30% |
| Plesioth Fin | 13% |
| Lg Lobstershell | 7% |