How do I get Ho-oh in HeartGold even though I've defeated team rocket at Goldenrod City Radio Station?

Question

I've got the rainbow wing, but what do I need to do now to get the Legendary Pokemon

Answer 1

You also need the Clear Bell (Beat Kimono Girls)
The Kimono Girls will challenge you (in the Dance Hall) once you have all 8 badges and Prof. Elm's Master Ball. After that, you can go to the top of the Tower and capture Ho-oh. Make sure you have plenty of pokeballs!

Hope I helped!