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5th Generation of MH - Variants (特殊個体)
1. Shrieking Legiana (凍て刺すレイギエナ)
2. Seething Bazelgeuse (紅蓮滾るバゼルギウス)
3. Blackveil Vaal Hazak (死を纏うヴァルハザク)
4. Ruiner Nergigante (悉くを殲ぼすネルギガンテ) 
4th Generation of MH - Variants (特殊個体)
1. Chaotic Gore Magala (渾沌に呻くゴア・マガラ)
2. Raging Brachydios (猛り爆ぜるブラキディオス) 
3rd Generation of MH - Variants (特殊個体)
1. Savage Deviljho (怒り喰らうイビルジョー) 
2nd Generation of MH - Variants (特殊個体)
1. Rusted Kushala Daora (錆びたクシャルダオラ)
2. Furious Rajang (激昂したラージャン) 
1st Generation of MH - Variants (特殊個体)
1. Scarred Yian Garuga (傷ついたイャンガルルガ) 
Here are some preview videos that show off some of the HC Monsters. 
HC Bulldrome - https://t.co/Zp2OvNNqwE
HC Kirin - https://t.co/baFcfg8nxF
HC Rajang - https://t.co/WWGivyfUDl
HC Kushala Daora - https://t.co/ByrOwwyVUN
HC Rusted Kushala Daora - https://t.co/StavyfZ392 
I feel that the HC Monsters get overlooked a lot in favor of the many monsters that appeared in G - Z. 
In terms of lore, their materials did give hints as to what caused them to change (Old age, taking better care of themselves, etc.). 
While I never played Frontier, I found the HC Monsters to be a pretty cool way to make some monsters more dangerous and a way to add more value to existing monsters (Some HC Monsters stood out more than others).  
Left = Standard Monster
Right = HC Monster https://t.co/m1GEeqdhkn