Valkyrie Profile: Lenneth Cheats

Valkyrie Profile: Lenneth Unlockable: Angel Slayer
You must defeat the Seraphic Gate 10 times.

Valkyrie Profile: Lenneth Unlockable: Voices, Movies, and More

To unlock all in-game voices, movies, et cetera, you must play through the game. Only be getting through the game in its entirety will you be able to unlock everything.

Valkyrie Profile: Lenneth Hint - Dragon Slayer & Goddess Pendant
Dragon Slayer ... Go back to Armgrins' house in Artolia at normal level and go to his room to the far left and you will recieve dragon slayer sword that Armgrin recieved from his father when he was alive.

Goddess Pendant ... Go to where the cutscene with Millia and Llewilyn happened in Lassen. It's under the trees to the very far right.