First go to the main menu press the "A" button and press "new game" then when your mom stops talking to you you save then it will tell you that there's another file saved and it will ask you do you want to delete it say yes then you started a new game.
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You cant,But if you want to change gender restart the game
you get either Pokemon sapphire or ruby and you link and restart the whole game on ruby or sapphire pick out a Pokemon and get to a Pokemon center and link to the other gba and trade for another Pokemon and repeat like twice
It means they cannot be found again unless you saved before you fought them then you can just restart. If you saved after you killed them then you can't find them again, so you have to restart the game if you want to catch them.
its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.
You cannot get a Yanma in Pokemon Emerald, as only Hoenn Region Pokemon can be found in Pokemon Emerald.