you dont
Chat with our AI personalities
In a small house at the battle frontier
No.
Talk to Scott to receive a special berry.
take the ferry from lilycove or slateport and Scott will be on the ferry and tell you thenext ferry you take is going to the battle frontier.
You can only get to it after you've won against the Pokemon League, then Scott gives you a pass there, and you can get there by either flying (after you've gotten there first) or taking the ferry.