They are located at the very bottom of tin tower in crystal! you will only need to talk to the leader after you have caught all three lendandary dogs (Raikou, Entei, suicune.) the leader will then open some stairs and give you the rainbow wing Ho-Oh is at the top as in [COLOR=orange]Gold[/COLOR] and[COLOR=silver]silver[/COLOR] and will be at level 60 which will come as great news for silver version owners because it is ten levels lower. (you might what to use the master ball cheat on Gameshark, it helped me no end!)
if you need any help about Lugia once you have captured Ho-oh,don't be afraid to give me a PM!
Paul the Pokemon Prof.
In fact i might as well put it on here!
Right, travel down to Whirl islands when you have the Silver wing from Olivine city keep to the right until you come to the first opening, you will need whirlpool to get rid of a few, once inside use flash to light up the cave.
Done that?
Good, now explore until you come to a water fall then travell down that, you will come to a small piece of land and enter the cave opening.
i would save your game here now go and surf in the water, Lugia should be there go up to him and press A then you will enter the battle.
Well Done You have just caught the two hardest Pokemon to capture on the game, give yourself a pat on the back.
I actually had difficultly with Ho-oh and the rainbow wing puzzle on crystal i only managed to get them thanks to [COLOR=red]Lady Katana[/COLOR] cheers . Lady K