use master ball, ultra, or great usually, master ball is grater to catch Ho-Oh.
You can catch him in Tin Tower if you have a Rainbow Wing.
Burnt tower, Tin tower and whirl islands.
Bell Tower a.k.a. tin tower,also means if you know how to get to tin tower you can get to bell tower
it is in Eukreteak City.
i catched him with 7 badges on gold with a pokeball you have to have a rainbow wing (gold you have to get to the top of radio tower)(silver you have to get to pewter city) after you fly or travel to tin tower go to the top and he will be waiting for you and the easiest way to catch him is by master ball
in the tin tower but you need rainbow wing in kanto region then you get it from this old guy, the tin tower is near the burnt tower
tin tower chase it first
Gastly is in there only at night with an 85% chance to find in Sprout Tower and 80% chance in Tin Tower. They are stronger in Tin Tower.
The tin tower is a seperate building from the burned tower, the tin tower is the largest tower in Ecruteak City next to the burned tower. You cannot go upstairs where Ho-oh is until you obtain the Rainbow Wing.
There is no Tin Tower is Silver. That's in Pokemon Tin, stupid.
on the top of the tin tower you need a rainbow wing to get there
The top of Tin Tower in Ecruteak city