Never even if the old man in vermilion city says it will come back in a year since time never passes in firered and leafgreen it will never come back besides the reason why is so you can go to the islands.
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It will not come back.
Once the SS Anne leaves it will never come back although an NPC claims it comes back in a year however since time doesn't pass in the game the boat never comes back.
you have to turn bill back into a human then he will give it to you.
this is how to get to the ss anne its in viridian city or a city buy the sea
you havre to beat the gym leader in Cinnabar island and when you get the island pass you can come back to S.S Ane to ride it ------ Or use the 'Surf Through Anything' glitch.