The rainbow pass is a key item in Pokemon FireRed version. To trigger the events to get it, you first need to own 60 different Pokemon.
With the Rainbow Pass.
you can, but you need to pass the elite four, give some guy a ruby and a sapphire, and you need a rainbow pass and a national pokedex to do so.
beat the elite 4
You need the Rainbow Pass
You can't because the Rainbow Pass is a Key Item which can't be traded without a hack or glitch.
Find the Ruby inside Mt ember and then give it to Celio.
It is not possible to obtain the rainbow pass in Pokémon Emerald. It is only available in Pokémon FireRed and LeafGreen.
The only way you can get to one island is with either a tri-pass or a rainbow pass (you get the rainbow pass after you beat the elite four as well as the tri-pass if you didn't already have it) but as soon as you do you go to Vermilion city and you are able to pick from islands one to three with the tri-pass but with the rainbow pass you can pick from one to seven islands! As long as you've been on the boat before to get something from someone. Just never mind that.
Go to Vermilion and hop on the fairy. note: you need the tri pass or the rainbow pass.
beat the elite four then talk to celio on island 1
You have to get the ruby and give it to celio. He will then give you a rainbow pass
no !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!