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The rocket launch is just a creative way to know how many weeks it has been since you started your game. Besides that, it does nothing. You cannot launch it, because Nintendo would have confirmed this otherwise.
Press the fire button
By getting an Editor for Pokemon Emerald that allows you to modify the sprites...
Not possible.
Nearly every Pokemon in Pokemon Emerald have a chance of being female or male. If you have captured a female Pokemon, it won't change into a male Pokemon. It is impossible (without any cheats) to make all wild Pokemon male.