I know, i didn't had time to add other items and test offsets.Hey sephiroth, thanx for the code you have provided so far, just incase you were unaware you are missing 63 items from the monster/synthesis items list, so I have made the adustments to the code and here are the last 63 items codes. (also weapons/armor/accessories start at 0x00012591:0xFF)
[Rest of items]
write at 0x00012552:0xFF
write at 0x00012553:0xFF
write at 0x00012554:0xFF
write at 0x00012555:0xFF
write at 0x00012556:0xFF
write at 0x00012557:0xFF
write at 0x00012558:0xFF
write at 0x00012559:0xFF
write at 0x0001255A:0xFF
write at 0x0001255B:0xFF
write at 0x0001255C:0xFF
write at 0x0001255D:0xFF
write at 0x0001255E:0xFF
write at 0x0001255F:0xFF
write at 0x00012560:0xFF
write at 0x00012561:0xFF
write at 0x00012562:0xFF
write at 0x00012563:0xFF
write at 0x00012564:0xFF
write at 0x00012565:0xFF
write at 0x00012566:0xFF
write at 0x00012567:0xFF
write at 0x00012568:0xFF
write at 0x00012569:0xFF
write at 0x0001256A:0xFF
write at 0x0001256B:0xFF
write at 0x0001256C:0xFF
write at 0x0001256D:0xFF
write at 0x0001256E:0xFF
write at 0x0001256F:0xFF
write at 0x00012570:0xFF
write at 0x00012571:0xFF
write at 0x00012572:0xFF
write at 0x00012573:0xFF
write at 0x00012574:0xFF
write at 0x00012575:0xFF
write at 0x00012576:0xFF
write at 0x00012577:0xFF
write at 0x00012578:0xFF
write at 0x00012579:0xFF
write at 0x0001257A:0xFF
write at 0x0001257B:0xFF
write at 0x0001257C:0xFF
write at 0x0001257D:0xFF
write at 0x0001257E:0xFF
write at 0x0001257F:0xFF
write at 0x00012580:0xFF
write at 0x00012581:0xFF
write at 0x00012582:0xFF
write at 0x00012583:0xFF
write at 0x00012584:0xFF
write at 0x00012585:0xFF
write at 0x00012586:0xFF
write at 0x00012587:0xFF
write at 0x00012588:0xFF
write at 0x00012589:0xFF
write at 0x0001258A:0xFF
write at 0x0001258B:0xFF
write at 0x0001258C:0xFF
write at 0x0001258D:0xFF
write at 0x0001258E:0xFF
write at 0x0001258F:0xFF
write at 0x00012590:0xFF
Some offsets are giving you dummy items which cannot be used in the game.