It was a special event route for the Pokewalker, but you can unlock it via connecting your 3DS to a pirate network. The myth of Surfing Pikachu was a whole thing back around Gen 1&2 proper so I think they did this one-time event around the time of HGSS release as a nod to that.
It was a special event route for the Pokewalker, but you can unlock it via connecting your 3DS to a pirate network. The myth of Surfing Pikachu was a whole thing back around Gen 1&2 proper so I think they did this one-time event around the time of HGSS release as a nod to that.