bit of a vague question.. But if it has set sail that means you obtained what you needed from the seasick captain being the HM cut,once it's gone its gone.
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To get the SS Anne to sail you have to go on board to the Captain's Room and obtain HM01 (Cut) from him. You will have to fight Gary (your rival) to reach him. Once you have HM01, and you leave the ship, it will set sail. To get the SS Anne to sail you have to go on board to the Captain's Room and obtain HM01 (Cut) from him. You will have to fight Gary (your rival) to reach him. Once you have HM01, and you leave the ship, it will set sail.
Actually, I think that is a Johto region pokemon, and seeing as Firered is a 1st gen remake, which is set in Kanto, you can't find it in the wild. You might be able to trade for it.
You don't, you get HM01 Cut from the captain. If you've gotten it and you get off the boat, it will set sail because you're done with what needed to be done there. If you haven't gotten it, it won't.
Make sure your Pokemon are capable of loosing a battle, or is poisoned. If your Pokemon are not poisoned, (all of them), make sure you left at least one battle before you get HM Cut, and then let all your Pokemon faint somehow. The ship will not set sail, and you can come back when you have a Pokemon with surf. Use surf of the wooded-looking bridge before entering the Anne, (Go right) and soon you'll see the truck. This truck will NOT give you mew, so this is kinda pointless.
Not regions seen in other games, but you can visit some islands that are introduced in the FireRed and LeafGreen games.