Mixing records in Pokémon Emerald (and Ruby and Sapphire) is a feature that lets players share game information to influence each other's games and includes things such as seeing their friends being mentioned in TV shows and being able to personally visit their secret base in-game without being connected to their game. After beating the elite four there will even be an NPC representing your friend that has their team for you to battle. This feature is unlocked once you reach Mauville City and its Pokémon center. The process is simple and very similar to trading.
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the closest you can be to a gym leader in this game is setting up a secret base with your best Pokemon then mixing records
you can't mix records and if you could you can get there secret base and other stuff but you can't mix records with firered and emerald.
No.
The story teller guy in Pokemon Emerald is one of five men that appear in the Pokemon centers. He tells the players about records they have set, and records set by others if the players have mixed records.
You can only get it in pokemon emerald or by trading records with someone who has it!:) !