103: Tyrannosaurus (East of the Castle of Ordeals, desert with the Tower)
147: Abyss Worm (Earth Blessing shrine, desert level)
149: Flare Gigas (Whispering Wind Grotto, levels beyond 30 on Lava floors)
152: Berserk Ogre (Whispering Wind Grotto, cave levels, fairy town level, marsh cave levels, desert cave levels)
153: Chimera Mage (Whispering Wind Grotto, levels beyond 30 on floating castle floors)
175: Earth Troll (Whispering Wind Grotto, earth cave levels)
178: Yamatano Orachi (Whispering Wind Grotto, levels beyond 30 on Lava floors)
181: Sekhret (Whispering Wind Grotto, earth cave floors, lava floors)
184: Undergrounder (Whispering Wind Grotto, levels beyond 30 on ice cave floors)

Basically put you're missing the elusive T-Rex, and most of the rare monsters in the Whispering Wind Grotto sub-dungeon.