* No$GBA is a single-player emulator. It's designed to run a single game instance at a time. It doesn't have built-in features for connecting multiple emulated games together.
* Linking requires specific hardware features. The original Nintendo DS had features like wireless communication for linking games. Emulators don't replicate this hardware functionality.
Alternatives for Multiplayer:
1. Real DS Consoles: The best way to experience Pokemon Diamond and Pearl multiplayer is with actual Nintendo DS consoles.
2. Virtual Console: If you have a Nintendo Switch, you can download Diamond and Pearl from the Virtual Console and use the Switch's online features for linking.
3. Multiplayer Emulation Tools: Some advanced emulators or external tools might exist for simulating multiplayer experiences, but they are often less reliable and may not be legal to use.
Important Note: It's crucial to ensure you legally obtained your Pokemon games and that you're using emulators within the legal limits of your region.
Please let me know if you have any further questions about Pokemon games or emulators!