Here's why:
* The Time Capsule is a storage device: It's used to transfer Pokémon from one generation to another (like from Red/Blue/Yellow to Gold/Silver/Crystal).
* Trading requires only one Link Cable: You can trade Pokémon between two Game Boys using a single Link Cable.
Here's how you'd use the Time Capsule with one Game Boy:
1. Transfer Pokémon from Red/Blue/Yellow: Use the Time Capsule to transfer Pokémon you want to bring into Gold/Silver/Crystal.
2. Connect two Game Boy systems: Use a Link Cable to connect two Game Boys, one with Pokémon Gold and one with another game (either Gold/Silver/Crystal or even Red/Blue/Yellow).
3. Trade Pokémon: Use the trade option to exchange Pokémon between the two systems.
Important Notes:
* You can transfer Pokémon from Red/Blue/Yellow to Gold/Silver/Crystal, but not the other way around.
* The Time Capsule can only store a limited number of Pokémon.
* You will need to access certain locations in the game (like the Day Care) to make full use of the Time Capsule and trading functions.
Let me know if you have any more questions about Pokémon trading!