After you beat the elite four.
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Leftovers are an item that you can give to Pokemon to hold. In Pokemon Emerald, you can get them from the bins on the SS Tidal.
Beat the elete four 19 times.
Beat the elite four. Then go to Slateport's port and the ferry is there.
He is on the S.S. Tidal being the captain with his Peeko
No, there aren't any whirlpools in Emerald. Its basically useless if you ask me. You need the move in HG/SS though.