When can I first take a ship from Slateport in Emerald?

Question

In other words, how much do I need to accomplish before I can take a ferry or a ship from Slateport City?

Comments

Or Lilycove for that matter...

Answer 1

After beating the Elite 4 and getting into the Hall of Fame, you can ride the S.S. Tidal, which has a lot of trainers, and is used to get to Event Islands and the Battle Resort.

Source

Hope I could help!

Comments

So even if I had the required ticket/map, I'd still need to beat the Elite 4 before being able to sail anywhere?

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Yeah, pretty much