With some kind of pokeball. Maybe you should have asked how to find/get to ho-oh instead and not how to catch it.
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
You can catch Hoho at night.
if you use the action replay rebattle code you can try to battle it again or try to catch it
you don't.....you trade them......
You can't catch Rotom in heartgold.
you cant catch him in heartgold you can only get him in soulsilver
In HeartGold you can catch Kyogre.
you need to migrate it from one of those original games
You can only catch Vulpix in SoulSilver, not in HeartGold. You can catch it on route 36 and route 37.
In pokemon Heartgold
No
get the rainbow wing and get all 8 gym badges from jhoto and go to bell tower in ecruteak city