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.
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7 island a canyon
go to 7 island
A good place would be 7 island.
To get a Tyranitar, you have to catch a Larvitar on 7 island and make it evolve.
do the elite 4 then go to 7 island and fish near the unkown caves