Heres where i got everything, although i dont know if you can get them all in disc 1.
Dragon fangs - Blue dragons
Pulse Ammo - Energy crystals from Ruby Dragons
Adamantine - Minotaur card

Come to think of it, dont you need to get the Weapons Mon First magazine to get the lionheart? Coz if you do then its impossible to get the lionheart in disc 1 (without gameshark, etc).