You need to have beaten the Pokemon league and beaten the kimono girls in ecruteak dance theatre. Then they give you a bell (after all that hard work!), then you go to the top of the bell tower and the kimono girls do a little dance. After what seems like forever, the camera changes and shows something rare approaching..... (i don't want to spoil it)
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Once you have the itemfinder and pokeflute go to the top of Pokemon Tower which is in Lavendar Town, once your at the top stand in the spot where Mr Fuji used to be and use the itemfinder if your in the right spot you should dig up a Soothe Bell item.
you go to the top because you get ho oh
Use the itemfinder at the spot where mr fuji once stood at the top of Pokemon tower you should dig up a soothe bell. where mr fuji was standing use your itemfinder there
Bell Tower a.k.a. tin tower,also means if you know how to get to tin tower you can get to bell tower
After you do the team rocket thing the guy gives it to you at the top of the radio tower.