you have to beat cinnabar leader. first you must enter cinnabar mansion and get the key. then you can fight against the leader
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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.
in 4-7 islands
You can't catch a wild butterfree in Pokémon fire red. You have to catch either a Caterpie or Metapod and evolve them. Caterpie evolves at level 7 and Metapod evolves at level 10. Have fun! :)
7 island a canyon
go to 7 island