Thank you alienhunter, it took me a while to find the correct video, but now I can continue my game ^^
But I have a problem, I must go to Valencia Island but the weather is always bad in Vermilion City and from Olivine City the ship only sets sail to Vermilion.
What can I do about it?
If I recall correctly, you need to receive a call from Prof Oak so he can tell you about a new ship ticket. I received his call when I was in New Bark, in front of home, but I don't know if it needs to be there. Anyway, after he talks to you, just go to that new building in Vermilion and get your new ticket. Then you need to go back to New Bark and surf south, to a new route, to find the Orange Islands Gate - Undersea Express.