go to the eighth floor and beet the trainer
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Cubones can be caught on Seven Island.
Onix can be found on seven island, six island and rock tunnel.
You must beat the seven gym leaders, the elite four, and your rival. Then you have to capture 60 Pokemon to get your Rainbow pass the will allow you to travel to Island 7 in Pokemon FireRed.
you can find a kings rock on seven island in sevault canyon.
Skarmory is a slightly rare pokemon it occasionally appears on Seven Island at Sevault Canyon.