To catch Ho-oh you need a clear bell and the wing. For Lugia it's the silver wing and a tidel bell.
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Well, you don't necessarily need cheats to get the Rainbow Wing. What you have to do is after defeating the Elite Four, go to Pewter City. Somewhere there you can find a little ledge with an old guy on it; talk to him, and he will give you a Rainbow Wing. I'm sure you know what that's used for . . . I hope . . . otherwise I have to explain . . . just ask someone else if you don't know what it's for.
You get the Rainbow Wing from a man in Pewter City next to the poke mart
Ah, the Rainbow Wing is a special item in Pokemon Crystal that you can get by talking to the Copycat in Saffron City after giving her back her lost Clefairy doll. She'll then give you the Rainbow Wing, which is needed to encounter the legendary Pokemon Ho-Oh at the Tin Tower. Just keep spreading kindness and helping others, and you'll find the Rainbow Wing in no time.
the fog badge and the rainbow wing
you need the 8th gym badge and rainbow wing and go to the top of bell tower