Phantasy Star IV Information mongers
Two persons in the Algol star system should be visited under all circumstances.
The first is named Grandfather Dorin, an old Motavian, who lives in Tonoe. He is interested not only in measurements but has some information about the Alshline medicine. You will never find it without speaking to him. And Gryz, who seems somehow related to him, will not join your group.
The second guy with information will be found in Ryoun. He is the barkeeper of the local pub, named Gyuna.
Ask him for the whereabout of a hidden spaceship. Although he seems not very familiar with this fact, the clues he gives you are important for continuing your quest.