How do you catch Ho-oh?

Answer 1

Ho-Oh in Pokémon Gold and Heart GoldYou will get the Rainbow Wing after defeating Team Rocket in the Radio Tower incident. After getting all 8 badges, talk to Professor Elm, who will give you a Master Ball and tell you to find the the Kimono Girls at the Ecruteak City Dance Studio.

Defeat them all and you get a Clear Bell, which will make Ho-Oh appear at the top of the Bell Tower (in the North East of the city) Ho-Oh will be Lv. 45.

Ho-Oh in Pokémon Silver and Soul SilverGo to Pewter City and get the Rainbow Wing by talking to a man on a hill. This item will allow you to go into the Bell Tower. Ho-Oh will be Lv. 70. Ho-Oh in Pokémon Fire Red and Leaf GreenYou find Ho-oh on Navel Rock. (Requires a Mystic Ticket)
In Gold:You will get the Rainbow Wing after defeating Team Rocket. After getting all 8 badges, talk to Professor Elm, who will give you a Master Ball and tell you to find the the Kimono Girls at the Ecruteak City Dance Studio.

Defeat them all and you get a Clear Bell, which will make Ho-Oh appear at the top of the Bell Tower (in the North East of the city) Ho-Oh will be Lv. 45.

In Silver:

Go to Pewter City and get the Rainbow Wing. This will allow you to go into the bell tower. Ho-Oh will be Lv. 70.

In FireRed and LeafGreen, you find Ho-oh on Navel Rock (which requires a Mystic ticket), and you can transfer the Pokemon to Generation IV via Pal Park.
I assume you mean Ho-oh. That hyphen is important :P Chuck a pokeball at it brainiac! :P Well you might need a few, I suggest around 50. It's good (as you should know by now) to weaken Pokemon to red health, the lower the better as long as you don't kill it, a status problem also makes it easier to catch, sleep, paralysis or frozen is best as it won't end up killing it like poison :P Keep on chucking balls, preferably ultra and have a few timers when your stuck there for a while. If you die or kill it then turn off! be patient and it shall be yours! Yes :P