For anyone who's interested, here's a list of enemy drops/skills that Sohli can learn (although it's really hard to miss them):
Note: All skills can also (and the last one only) be bought/obtained in the post-game dungeon "Shrine of Lust" (for 5000 Gold each - except for "Phoenix Flame", see below). This means you don't have to worry about missing certain skills (Absolute Zero, Detox, Magic Hammer) that can first be found in one-time-only dungeons or dungeons that become unavailable later.
- Flash: dropped by Pigman (50% drop rate), encountered in the dungeon (mountain) areas between North Rosetia and South Rosetia
- Bone Toss: dropped by Spiritus (50% drop rate), encountered at the scrapyard (dungeon) south of South Rosetia
- White Wind: dropped by Dust Devil (50% drop rate), encountered in the dungeon (mountain) area southeast of South Rosetia beyond the highway
- Provoke: dropped by Bonerman (50% drop rate), encountered on the world map north of Loremia.
- Flamethrower: dropped by LaserWalker (50% drop rate), encountered in the laboratory (City of Steel) where the children from Loremia are imprisoned
- Oil Bomb: dropped by Flaming Guard (50% drop rate), encountered in the power plant northeast of Loremia (chapter 3 onwards)
- Holy Rain: dropped by Blight Archer (50% drop rate), encountered in Vakh Aghat's control tower
- 300 Needles: dropped by Cactuar (30% drop rate), encountered on the desert island (and in the oasis dungeon there) east of North and South Rosetia (airship or at least the first improved ship needed)
- Absolute Zero: dropped by Ice Bomb (50% drop rate), encountered in the tower enclosed by mountains north of Tavart - one-time-only dungeon in chapter 3
- Detox: dropped by Floating Imp (50% drop rate), encountered in the swamp dungeon southwest of Serhes (which becomes unavailable at the end of chapter 4)
- Magic Hammer: dropped by Golem Warrior (50% drop rate), encountered at Miliyon Castle (floating dungeon version, outside areas) - one-time-only dungeon in chapter 3
- Confuse Punch: dropped by Demirror (50% drop rate), encountered in Miliyon Castle crater (chapter 4 onwards)
- Cross Slash: dropped by Obliterator (50% drop rate), encountered inside the Eternal Lord's tower in the City of Steel
- Deadly Horn: dropped by Dethcorn (50% drop rate), encountered in the dungeon (mountain) area between Zorgozia and the Mountain Fortress
- Toxic Vine: dropped by Sea Serpent (50% drop rate), encountered in the Sea Shrine dungeon on the northern continent
- Blessing: dropped by Icy Menace (50% drop rate), encountered in the dungeon (mountain) area east of Fiorr (from the northern exit) and in the snow field (side quest 12 location) beyond the aforementioned dungeon (from the northern exit)
- Bad Breath: dropped by Malboro (66% drop rate), encountered in the swamp dungeon far west of Serhes and in the Tower of Ragnarok (floors above the Protector Beta boss) (chapter 5)
- Pandora's Box: dropped by Hell Warlock (50% drop rate), encountered in the Rift Dimension inside the Citadel of Two Worlds (final main storyline dungeon) beyond the City of Light
- Phoenix Flame: dropped by Dyzio (100% drop rate), encountered in the post-game dungeon "Shrine of Lust" (first boss encounter)