Miten Pokemon Pearlissa voi päästä näihin saariin...? (peli on nintendo ds:lle)

no koskaan en ole peliä pelannut mutta google on ystävä
A boy in Canalave City has fallen ill and the only cure to his sickness is the
Lunar Wing, guarded by the legendary Pokemon Cresselia. By completing this
side-quest, you will have the opportunity to catch Cresselia, as well as visit
Fullmoon Isle.