you have to go to the battle fronteir after you beat the game
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battle tower
Guess what you get a prize im not sure what but you also get to do something, if you mix records with an emerald version compete in the single battle portion of the battle tower and when you get to match number 7 look its you from ruby! Your name and your Pokemon are battling your emerald isn't that cool plus you will get to see what kind of trainer you are Example: Say you entered the latis and regirock and beat the whole battle tower in ruby when you mix records with emerald play emerald and you will battle those Pokemon you will be assigned a trainer so it will say ruin maniac ruby wants to battle or something like that.
At the battle frontier near the battle tower.
In firered the battle tower is actually called the Trainer Tower but either way it works in a similar way that of the battle tower in ruby, sapphire and emerald only with a few catches. You can find the trainer tower in the northern portion of Seven Island.
I dont have Pokemon Emerald but its basically the same as Ruby and Sapphire so im pretty sure you have to win 100 battles in a row at the battle tower