Once you have beaten the Elite Four, in MT Ember, to your right, you will see two grunts in front of an open door. Beat both of them to make go away. When you get inside ,go througth the cave.
Warp to cave on Mt. Ember by gameshark or action replay.
after compliting first pokedex and beating league gampion.
You get your first Pokemon, then warp back there after beating the Pokemon league.
If you are referring to the old GBA games, then yes and no. You have to beat the Pokemon League in Ruby and Sapphire to get Rayquaza but in Emerald you can get him before beating the Pokemon League. Hope this helped.
You can get ditto in Pokemon ruby by beating the Pokemon league then going to the cave the fossil maniac is digging he will be finished digging and he will say to be careful that there are Pokemon in there the Pokemon in there are ditto.
no to trade between leaf green and sapphire or ruby u must beat the Pokemon league then go to the seven islands and find the ruby and the sapphire gems to be able to trade
fix the machine on island 1 find the ruby and the sapphire stones
you will go to Battle Frontier
Go to Ever Grande
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By beating the elite for then Beating the champion.
By either beating them or catching them.