Here are some facts that you might know.

1: It is virtually impossible to go to mirage island. If there is any hope to see mirage island, visit the man's house everyday.

2:If you visit the space center everyday, (i don't remember how many times), but, if you go there a number of times, the workers will let you go to the moon to capture deoxys, and or jirachi. I'll tell you soon on what number.

3:Kyogre is best captured with a timer ball. (just keep using weak moves to keep kyogre alive).

4:Once you capture all the pokemon in Pokemon Sapphire, go to the gamer freak building. Then, they will give you the National Deck.

5:You can migrate pokemon on to diamond if pokemon sapphire is in your GBA cartridge.

6:You can't get Groudon on your game unless you trade.

7:Once defeated game, you get back to your house. Then, your mother asks you if you seen a creture on TV. You say yes, then you tell if it is a boy or girl.
Girl=Latias.
Boy=Latios.

Look out for more facts! (on other games too)!