Here's why:
* Ho-Oh is a Legendary Pokémon: Legendary Pokémon typically only appear once per game.
* Unique Encounters: In SoulSilver, you encounter Ho-Oh in Ecruteak City after completing the FireRed event. This is a one-time event.
* No Resets: You can't reset the game and encounter Ho-Oh again.
However, you can:
* Trade for a Ho-Oh: You can trade with another player who has a Ho-Oh.
* Breed a Ho-Oh: If you have a Ho-Oh, you can breed it with a compatible Pokémon to get an egg that hatches into a Ho-Oh.
Let me know if you have any other questions!