After going the first time to the islands, just go to Vermillion City. At the port, where the cruise ship thing was.
For those looking, incase they don't have it yet, you go to the island with the lab and old Pokemon Mansion. beat the gym leader and walk outside Bill should show up. You get it after re-visiting Bill and the other computer guy, the second guy gives you a Tri-pass.
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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.
Simply show it to the sailor who took you onto the SS Anne.
You get Moltres After you get the seventh badge. You have to have the tri-pass. In 1 island you go to the top of mount ember. Caution: You need the move Strength and Moltres will be in lvl 50. He will know flame thrower.
I've got it, and i forget how you get it, but i think that you get it from Celio or Bill. Anyways, did you beat Blaine yet? when you get out of the gym in Cinnabar, Bill will come to you with a boat and ask you if you want to go to One Island, because for Celio. Say yes!!
i mean i was really think if it is exis in pokemon hg and ss