It's official: tallied up the Monstie List (81-90): Plesioth, Duramboros, Seltas Queen, and Tetsucabra are not available as Monsties. : r/ MonsterHunterStories
Egg Guide and List - Monster Hunter Stories 2: Wings of Ruin Guide - IGN
Egg Guide and List - Monster Hunter Stories 2: Wings of Ruin Guide - IGN
Egg Guide and List - Monster Hunter Stories 2: Wings of Ruin Guide - IGN
Monster Hunter Stories 2: Wings of Ruin - The Cutting Room Floor
Steam Community :: Guide :: Monsters, Locations, Drops, and Weaknesses
Monster Hunter Stories 2 Egg Guide: Where to Find All Monstie Eggs
Oeufs d'Alcala - Monster Hunter Stories 2 : Liste de tous les œufs & espèces de monstres - Millenium