get all 16 badges and beat Pokemon league, go to pewter city, talk to guy next to pokemart, he gives you something, then go to bell tower, hooh is at the top at lv 70
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no you can not, you can only get ho-oh in Pokemon heart gold or soul silver, or you can get it in global trade.
in heart gold go to top of bell tower you meet hoho in soul silver go to whirl insland get lugia
really it dose not matter because the only different is that in heart gold you will get hoho at lvl 50 and get lugia at lvl 70 and in soul silver you get lugia at lvl 50 and ho ho at lvl 70 and you get groundon at lvl 50 in soul silver and kyogre at lvl 70 and in heart gold kyogre at lvl 50 and groundon at lvl 70 o and one other difference is that you get latios in heart gold and latias in soul silver.
in soul silver
you don't have friend codes in soul silver.