Tales Of Phantasia Codes -

Hint: Psion Bolt:
To learn Psion Bolt 100%, get into a battle with a flying monster. Go far so that it becomes a long range target. Use Psion Bolt repeatedly until you run out of Tech Points. Use Psion Bolt 100 times.

Hint: Author reference:
When in the library when you first get Klarth, in one of the bookcases there is a letter written by J.R. Eddings. This is actually a reference to two authors, J.R.R Tolkien and David Eddings.