This is what I think:
1(Hack)read the signs then go to Clestial tower ring the bell twice,save,then ring it again and you battle Rayquaza
2(Hack)Somewhere on the 1st floor you can find Kyorge dwelling in it and its the cause of the sounds. also if this part is false what is the cause of the sounds?
3(not hack I hope)go to the top floor with the 3 legendary bird Pokemon and someone from Johto appears and also does Lugia (and for some reason EVERYONE says the place turns gold
so like before whats the point?Also is any of this somehow true?