How to acquire various Elemental Sprites throughout the game.

Code - Effect
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40 Below - Defeat the shadow troll in the ice cave. 
Chilla - Rescue Lenya. 
Flex - Defeat the shadow troll in Sulfer Cave. 
Major Ruin - Defeat the Shadow Troll in Lobster Hollow. 
Pummel Weed - Defeat the Shadow Troll in the Enchanted Kingdom. 
Rubble - Defeat the Shadow Troll in the Forgotten Forest. Ash Rescue Halis. 
Thermite - Shadow Troll at Ogre Swamp