When you wish to begin a playthrough of this game, go to the file selection screen, then reset the console. Start a new file as normal and immediately find the two other Red Jewels in South Cape (one in the school belfry and one in a pot in the lower floor of Lance's house). From there immediately go to the Seaside Cave, and enter and exit seven times. What this does is ensure that a fisherman appears just outside the cave, on the pier. Examine his pot for a Red Jewel. These tasks done in this order circumvents what can otherwise be a very time consuming task of entering and leaving the cave sometimes dozens of times, and possibly missing the Jewel by accident.