Pokémon Gold and Silver/Tin Tower

'The Legendary Bird, Ho-oh, lives on the roof of the Tin Tower. You can't go up the Tower without the Rainbow Wing, which you will get from the Radio Station Manager in Goldenrod City in Gold, from the old man in Pewter City in Silver, or from the guardians of Tin Tower (after you've caught Suicune, Raikou, and Entei) in Crystal.'

Ascend the tower
If you're playing Gold, you will get the Rainbow Wing in Johto. If you're playing Silver, a monk will block the stairs on the first floor and you won't be able to continue up until you get the Rainbow Wing in Kanto.

This Ecruteak tower has much easier enemies than Lugia's dungeon, but it is far more complicated to negotiate. Floors 3 through 6 are full of one-way ramps, and to get to the 6th floor, you'll need to come up from the ladder near the upper left corner, and hop down a series of platforms to the left of the Rare Candy found in the middle of the 5th floor.

The three final floors have teleport squares that can be confusing without a map. Start with the square at the bottom of the 7th floor, and follow the sequence until you reach the stairs to the roof on the ninth floor.

Ho-oh on top
The Legendary Bird, Ho-oh, is on the Tower's roof. Ho-oh will be at level 40 in Gold, and level 70 in Silver. Save your game when you get to the rooftop, and be sure to have plenty of Ultra Balls on hand, and maybe a few Potions, Revives, and other helpful items. You can use the Escape Rope, Dig or Fly to leave the Tower quickly.