There is no clear bell in Soul Silver. All you need to have to catch Ho Oh in Soul Silver is the Rainbow wing.
Well, Actully there is No clear bell ion soul silver, however you can still catch Ho-oh in Bell Tower With only the Rainbow feather, so u don't need a clear bell
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Ho-oh Is lvl 70 With Sacred Fire, Punishment, Ancient power, and mist or safegaurd i think.
If your wondering were to get a Groudon, Beat RED his Pokemon are: Pikachu Lv88, Snorlax Lv 81, Lapras Lv 80 , Venusaur,Charizard,Blastios all Lv 84. Then Goto mr.Pokemon he'll give u the red orb. Then go to The safiri path, some guy will tell u about the embeld tower (were u get groudon) then find embled tower then there will be lvl 50 groudon with moves: Rest, Eruption, Earthquake, and ancient power
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You find it in the national park or when trading with Janine (any Pokemon for her Steelix).
u need 2 give it a sooth bell
You can catch chatot at the burned sprout and bell towers.
you will get the tidal bell that will awake lugia
After defeating the 5 Ecruteak's Kimono Girls they'll give you the Clear Bell.