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
my poor tetsu : r/MemeHunter
Monster Hunter Stories 2 Egg Guide: Where to Find All Monstie Eggs
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 Beginner's Guide: Top 10 Tips You Should Know Before You Play - Fextralife
Egg Guide and List - Monster Hunter Stories 2: Wings of Ruin Guide - IGN