#1. Door IIII of the Clock Room in the Temple of the Ancients.
#2. Inside Gaea's Cliff. Look for a secret passage in the wall south of the chest with Cid's Javelin.
#3-99. Morph Master Tonberry in the Northern Cave. Morph Ho-Chu in the Battle Square.

Quote Originally Posted by d£v!l'$ ph0£n!x
u can morph a tonberry in the northern cave for one
Tonberries are found only in the Battle Square. They morph into Elixirs.