Here's why:
* Different Save Data Structures: Each game uses a unique save file structure. Emerald's save data is incompatible with Ruby/Sapphire's.
* No Transfer System: Unlike later generations, there's no in-game transfer system between these games. You cannot send Pokémon or data between them directly.
However, you can transfer Pokémon using a specific method:
1. Use a GameShark or Action Replay: These devices can allow you to modify game data, including Pokémon data. You could potentially use them to extract Pokémon data from an Emerald save and import it into a Ruby/Sapphire save. This is a very advanced technique and can be risky if you don't know what you're doing.
Important Considerations:
* Risk of Corrupted Data: Modifying save data is dangerous and can easily corrupt your save files. Be extremely careful if you choose to use this method.
* No Official Support: Nintendo does not officially support these methods, so use them at your own risk.
Alternatives:
Instead of trying to mix records, consider these alternatives:
* Play the games separately: Enjoy each game's unique features and challenges.
* Trade Pokémon with friends: If you have friends who play Ruby/Sapphire or Emerald, you can trade Pokémon between those games.
* Wait for later generations: In later generations, the transfer system allows you to move Pokémon between generations.
Remember, always back up your save files before attempting any modifications.