In order of lowest hp. Kiana Alpha+ 1580hp Korwil Old + 2050 hp Scoria Guardian + 2750 hp Mutated Beladoth Old Alpha + 3200 Mutated Oturugi Stalker 3520 hp Teladon Dominant + 3700 hp Huon Old Alpha+ 3800hp Pandi Old Alpha+ 3800 hp Yuka Old+ 3950 hp Kamaldon Guardian + 4150hp Mutated Kamaldon Provider 4580 hp Please keep in mind that these mobs may or may not be present in the game at the time, this list is made up purely from output from entropiawiki queries.
Songkra Valley now has lvl 50+ Mutated Beladoth and Mutated Otorugi. Lucky 7's Hunting Event is in effect for your chance to win even more.