you cant
actually you can after you deafeat the champion you can go to the kanto region where after beating there 8 gym leaders you can obtain a silver wing(lugia) or rainbow wing (ho-oh) after that head to bell tower or the whirl islands to get them PS after deafeating kanto you can also get mewtwo in cerulean cave :)
As of right now the answer is yes because it's the same as Gold, Silver and Crystal were. Yes, you can. If you get HeartGold you encounter Ho-oh at level 45 and Lugia at level 70. If you get SoulSilver you get Lugia at level 45 and Ho-oh at level 70.
you get the wing of the hoho in soulsilver and the wing of lugia in heartgold
Yes. You will be able to find Hoho on top of the bell tower after you have the rainbow wing and the clear bell and you can get lugia too
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 heart gold go to top of bell tower you meet hoho in soul silver go to whirl insland get lugia
Abandoned tower hoho sefoam islands lugia and others hop around
there are only 8 rare Pokemon in soul silver (articuno,zapdose,lugia,entay,hoho,rioku,moltress,suikune)
Assuming you mean Ho-oh or Lugia, Lugia would win because he's a Psychic type and could control Ho-oh. And if you mean Hoho junk food, Lugia would still win.
you don't.....you trade them......
If you are talking about Hoho, Lugia, etc... then you will need a cheat.
You can catch Hoho at night.
hoho at bell tower, lugia at whirl islands, entei and raikou randomly around the place (you can see them on the map), kyogre (heartgold only) with blue orb and groudon (soulsilver only) with red orb. they are both at embedded tower.