After surfing to the right of New Bark Town, talk to the fat guy when you reach dry land. He'll tell you to look at your Pokégear map and you'll see you are now in theoriginal Pokémon World from Red, Blue, & Yellow.

Next you'll enter a cave that has a waterfall. Surf up it and then down the other side to get out of the cave.
Once you exit the cave you'll find a house. Inside an old lady will give you TM 37, Sandstorm, for talking to her if your Pokémon are loyal enough that is.
Next you'll surf east some more and encounter more trainers when you reach land. There's new Pokémon to catch and trainers to fight.
Before heading onwards, there is a house with a woman who will heal all your Pokémon for you.
Head north and you'll eventually reach Victory Road.

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