User blog comment:BannedLagiacrus/Discussion of the Week: Hidden Monsters/@comment-26421638-20160610174540

1) Pretty much all the 1st Gen Ones... Especially Khezu, Diablos and Gravios unlocked via "Armor Crafting" and Garuga with USB connectivity

2) Fatalis Trio in MHF2/MHFU... Doing all the Challenge Quests (And other stuff) when were Insanely difficult in that Time... Still Today I haven't unlocked G Rank Fatalis in MHFU!

3) For Some Reason, I like to wait for a DLC quest to unlock a Monster, this gives you one more reason for continue to play!

4) Yes! Until we don't have anymore something like Fatalis in 2nd Gen...

5) Some Frontier Monsters and Black Dragons.

6) H**L NO!